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Stereo Wiring [message #253087]

Tue, 24 June 2014 01:47

glenn2726

Messages: 234
Registered: June 2014
Location: Topeka, Kansas

Karma: 2

Senior Member

Hi All, looks like this has original wiring for a stereo. Who has installed a newer stereo/radio in first generation GMC that doesn't have 2 separate wires to each speaker? Looks like left side has ( tan, green/white), right side is (green, green/black), red wire for power, gray wire for (lighting?) and that is all the wires I saw. Also there is a wire for the antenna but I don't have an antenna, was that what looks like is missing from top of roof in the center? I guess a wiring schematic would help if anyone has one. The rear speakers had a common Black wire and the speakers back there were green/white and green/black. I am putting a din type stereo in with DVD player and the hole in the dash will accomodate it now that I have removed the ears for the older style radios. I will have to cut the faceplate in order to finish the install after I get the wiring done. Do we need to run all new wires for the speakers or has anyone done the cheat to keep from running all new wiring? The front 2 speakers would be the easiest. Where does the wire loom go down the wall at for the front speakers? Thanks for any help to make this less painless...lol.. Glenn

Glenn W Topeka, KS 1974 GMC 26 ft. Color:Camel Interior:Canyon Land Side Bath, Rear Sitting Area

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Re: Stereo Wiring [message #253088 is a reply to message #253087]

Tue, 24 June 2014 03:00

Bullitthead

Messages: 1411
Registered: November 2013

Karma: 5

Senior Member

The factory speakers had common ground wiring, the return path is through the vehicle chassis. That allowed them to power the speakers with one wire each. Any BTL (balanced transformerless) output system is going to fry its amplifiers if you try using just one of the wires for each channel. Don't do it. The cheat is to use a floating ground adapter for each set of speakers, one for the front and one for the rear. Should be available at your local stereo shop. You could also run new wires for the front and just use the adapter for the rear speakers. This is only suitable for lower power, not for blasting the neighborhood.

Terry Kelpien ASE Master Technician 73 Glacier 260 Smithfield, Va.

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Re: [GMCnet] Stereo Wiring [message #253089 is a reply to message #253087]

Tue, 24 June 2014 04:09

Mr ERFisher

Messages: 7117
Registered: August 2005

Karma: 2

Senior Member

Read here
http://gmcmotorhome.info/living.html#din

Watch out wiring. I think the grey wire ,that looks kike power ground, is
not ground...
Erf

On Monday, June 23, 2014, Glenn Whitt wrote:

> Hi All, looks like this has original wiring for a stereo. Who has
> installed a newer stereo/radio in first generation GMC that doesn't have 2
> separate
> wires to each speaker? Looks like left side has ( tan, green/white),
> right side is (green, green/black), red wire for power, gray wire for
> (lighting?) and that is all the wires I saw. Also there is a wire for the
> antenna but I don't have an antenna, was that what looks like is missing
> from top of roof in the center? I guess a wiring schematic would help if
> anyone has one. The rear speakers had a common Black wire and the speakers
> back there were green/white and green/black. I am putting a din type
> stereo in with DVD player and the hole in the dash will accomodate it now
> that I
> have removed the ears for the older style radios. I will have to cut the
> faceplate in order to finish the install after I get the wiring done. Do we
> need to run all new wires for the speakers or has anyone done the cheat to
> keep from running all new wiring? The front 2 speakers would be the
> easiest. Where does the wire loom go down the wall at for the front
> speakers? Thanks for any help to make this less painless...lol.. Glenn
> --
> Glenn W
> Topeka, KS
> 1974 GMC 26 ft. Desert Sand
> Side Bath
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>

--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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Re: [GMCnet] Stereo Wiring [message #253092 is a reply to message #253089]

Tue, 24 June 2014 06:59

tphipps

Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL

Karma: 9

Senior Member

The OEM antenna is mounted in the hole in the roof. I have seen some use side mount antennas, available at most auto parts places. You may need to add an antenna ground (not vehicle ground)if you use a side mount on the SMC portion of the front.
There are some modern active antennas that are low profile that perform as well as or better than the OEM style, especially on FM frequencies. You will need to provide 12v to power them.
Tom, MS II

2012 Phoenix Cruiser model 2552 KA4CSG

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Re: Stereo Wiring [message #253093 is a reply to message #253087]

Tue, 24 June 2014 07:03

jhbridges

Messages: 8412
Registered: May 2011
Location: Braselton ga

Karma: -74

Senior Member

I took one look, remembered GM radios of the day, and just pulled two new speaker wires behind the cabinets on the driver's side and passed one over the bath in back above the cap with a fish tape. Amazon had some decent speakers which fit with minor mods and I had a spare Kenwood HD receiver which fits in the original dash hole without a lot of histrionics.
Someone - Crutchfield? - makes isolation transformers to use one side grounded speakers with an aftermarket non-grounded radio. Not very good fidelity, but they work.
Pull the wire and be done with it.

--johnny

Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons. Braselton, Ga. I forgive them all, save those who hurt the dogs. They must answer to me in hell

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Re: [GMCnet] Stereo Wiring [message #253094 is a reply to message #253092]

Tue, 24 June 2014 07:10

tphipps

Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL

Karma: 9

Senior Member

Also, when you purchase the radio, get a "universal" wiring kit for the correct year range for the GMC. Makes it much easier to connect the wiring correctly and easily. Wal-Mart has them, as well as a good car stereo shop, for about $10.
Write down the wiring color and function, matching OEM color to the new radio wiring. Beats going crazy with your hands in the dash.
The OEM grey wire does not go to power the radio. Ground the radio to the firewall.
I found it very easy to run a separate power wire directly from the second battery, located in the front of the vehicle. Never have to worry about running down the starting battery.
Tom, MS II

2012 Phoenix Cruiser model 2552 KA4CSG

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Re: [GMCnet] Stereo Wiring [message #253095 is a reply to message #253094]

Tue, 24 June 2014 07:23

James Hupy

Messages: 6806
Registered: May 2010

Karma: -62

Senior Member

While we are on the subject of the Grey wire, it comes from the
instrument/dash light dimmer rheostat. When turned to dim, it would appear
that it is a ground. When turned to bright, it appears to be a 12 volt
source. It goes to the lights in the radio on some models, but it will not
work to power the radio.I found this out through personal experience. Use
this info if you choose to, or not.
Jim Hupy
In Santa Fe, NM with the route 66 rolling rally. Albuquerque later today.
We had 18 people for dinner at Marias last night. Great times, great food
and libations.
On Jun 24, 2014 6:10 AM, "Thomas Phipps" wrote:

> Also, when you purchase the radio, get a "universal" wiring kit for the
> correct year range for the GMC. Makes it much easier to connect the wiring
> correctly and easily. Wal-Mart has them, as well as a good car stereo
> shop, for about $10.
> Write down the wiring color and function, matching OEM color to the new
> radio wiring. Beats going crazy with your hands in the dash.
> The OEM grey wire does not go to power the radio. Ground the radio to the
> firewall.
> I found it very easy to run a separate power wire directly from the second
> battery, located in the front of the vehicle. Never have to worry about
> running down the starting battery.
> Tom, MS II
> --
> 1975 GMC Avion
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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Re: [GMCnet] Stereo Wiring [message #253097 is a reply to message #253095]

Tue, 24 June 2014 08:22

George B.

Messages: 213
Registered: February 2012

Karma: 1

Senior Member

I installed a new stereo in my 73 and ran into all the problems above. I tried using the ground adapter from Churchfield mentioned but had no luck with it. Ended up running the wires to the rear per the instructions from Jim Bounds, a task but worth the effort. While you are at it run a mini audio cable to hook up other devices to the AUX input on your stereo. Also powered the stereo off of the house battery with good results of being able to use the stereo while parked for long hours with out draining the engine batterty.

George Butts Las Vegas Nevada 73 "Custom 26' Q" & 76 23' Birchaven 71 Honda 600 Coupe & 01 Tracker Toads

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Re: Stereo Wiring [message #253098 is a reply to message #253087]

Tue, 24 June 2014 08:42

glenn2726

Messages: 234
Registered: June 2014
Location: Topeka, Kansas

Karma: 2

Senior Member

Thanks to all for the help on wiring in a new stereo/radio...I know I'm getting ahead of myself as I have other pressing repairs to do but since I'm going to have to add wiring to the rear for tv..etc, thought it was a good time to ask. Routing the new speaker wiring for the rear speakers down the drivers side seems like a good idea but I will need to run the coax and other wiring to the rear for a tv on the passenger side so will run all my wiring down passerger side of coach. I think the way to go there will be to drop the wires behind the refrigerator (original 12v/120v) and fish through the already there hole in the wall for what I thought was 120 volt wire (no place to plug it in under the bathroom sink) and then on through to the back of the coach where the tv will be located. I plan on wiring for HDMI at the rear of the coach as well as coax for TV, that way whatever you are watching in HD at the Living Area can also be viewed in the rear of the coach as well as local tv channels via the antenna. Since my coach doesn't have a tv antenna will have to mount one to the roof and near the overhead cabinet on the passenger side where all my electronics and tv will be located. I will install a powered roof antenna in order to pull in stations while camping so will need to install the power supply and 12 volt power as well as the splitter to run 2 tvs (living area and bedroom in rear). TV wiring at the rear of the coach will be located near the 120 volt receptacle at the rear passenger side of coach or ran up the wall and into the overhead storage compartment from which a lightweight LED TV will hang. There will also be a Coax ran to the propane tank storage area for the purpose of connecting an outdoor tv. The coax can be rolled up and left in that compartment for when needed. Wiring for 2 outdoor speakers will also be in that area allowing you to set your speakers up for your in dash radio/stereo and not have to put any holes or boxes on the outside of the coach. Since there is no 120 volt outlet on the outside of the coach, I will add one to the same storage area by teeing off of the outlet in the rear of the coach above this storage area. If anyone decides to do this be sure the outlet is of the GFI type in order to protect from any close encounters with the elements...lol... Also since my electronics...hdmi switcher, Satellite TV Receiver and WDTV box will all be located in the overhead cabinet behind the passenger seating I will install a remote ir extender to control everything with the cabinet door closed. You can purchase these extenders to control as many items as you want, I will use 1 capable of controlling 4 electronics. The eye to receive your remote signals mounts outside the cabinet and the wire runs into the cabinet and there are eyes to attach to each piece of electronics you are controlling (these are easily mounted at the remote pickup on the front of each device as they come with sticky pads attached). Since I will be using a Satellite TV Receiver I will also require a piece of coax in order to connect a satellite dish to the receiver. I will run that coax to the rear of the coach and out through the storage area for easy connection. My choice of Satellite Dish is the Dish Network Tailgater. It receives its power through the coax so no need to run a separate wire. This dish is portable so you can set it up wherever you have a clear line of sight to the south and it receives all 3 satellites you need for both Standard as well as HD channels. The best part is it automatically finds the satellites for you so all you have to do is connect it to the satellite coax, set it on the ground or picnic table and turn your receiver on and get ready to watch tv. This I have found is not only cheaper than mounting a satellite on the roof of the coach but also keeps you from having to carry a second satellite dish due to when parking your coach and having trees blocking your satellite reception, this way all you have to do is set this satellite cube up with a clear line of sight to the south. The price is less than $400 for the cube so it is quite a bit less than most other dishes that mount on your rooftop..plus no holes in your roof...lol..Any questions just give me a shout. Thanks again, Glenn

Glenn W Topeka, KS 1974 GMC 26 ft. Color:Camel Interior:Canyon Land Side Bath, Rear Sitting Area

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Re: [GMCnet] Stereo Wiring [message #253117 is a reply to message #253098]

Tue, 24 June 2014 10:07

Rob

Messages: 651
Registered: November 2013
Location: Victoria, BC

Karma: 3

Senior Member

With regards to OTA HDTV - I recently installed one of these amplifiers to go along with my Sensar IV antenna:

http://www.winegard.com/sensar/sensar-pro.php

I'm very happy with it. I rarely camp where I can pick up any TV - but when I do, this works great!

Rob
Victoria, BC
76 Royale - Rear Twins/Dry Bath

On 2014-06-24, at 6:42 AM, Glenn Whitt wrote:

> Thanks to all for the help on wiring in a new stereo/radio...I know I'm getting ahead of myself as I have other pressing repairs to do but since I'm
> going to have to add wiring to the rear for tv..etc, thought it was a good time to ask. Routing the new speaker wiring for the rear speakers down the
> drivers side seems like a good idea but I will need to run the coax and other wiring to the rear for a tv on the passenger side so will run all my
> wiring down passerger side of coach. I think the way to go there will be to drop the wires behind the refrigerator (original 12v/120v) and fish
> through the already there hole in the wall for what I thought was 120 volt wire (no place to plug it in under the bathroom sink) and then on through
> to the back of the coach where the tv will be located. I plan on wiring for HDMI at the rear of the coach as well as coax for TV, that way whatever
> you are watching in HD at the Living Area can also be viewed in the rear of the coach as well as local tv channels via the antenna. Since my coach
> doesn't have a tv antenna will have to mount one to the roof and near the overhead cabinet on the passenger side where all my electronics and tv will
> be located. I will install a powered roof antenna in order to pull in stations while camping so will need to install the power supply and 12 volt
> power as well as the splitter to run 2 tvs (living area and bedroom in rear). TV wiring at the rear of the coach will be located near the 120 volt
> receptacle at the rear passenger side of coach or ran up the wall and into the overhead storage compartment from which a lightweight LED TV will hang.
> There will also be a Coax ran to the propane tank storage area for the purpose of connecting an outdoor tv. The coax can be rolled up and left in
> that compartment for when needed. Wiring for 2 outdoor speakers will also be in that area allowing you to set your speakers up for your in dash
> radio/stereo and not have to put any holes or boxes on the outside of the coach. Since there is no 120 volt outlet on the outside of the coach, I
> will add one to the same storage area by teeing off of the outlet in the rear of the coach above this storage area. If anyone decides to do this be
> sure the outlet is of the GFI type in order to protect from any close encounters with the elements...lol... Also since my electronics...hdmi switcher,
> Satellite TV Receiver and WDTV box will all be located in the overhead cabinet behind the passenger seating I will install a remote ir extender to
> control everything with the cabinet door closed. You can purchase these extenders to control as many items as you want, I will use 1 capable of
> controlling 4 electronics. The eye to receive your remote signals mounts outside the cabinet and the wire runs into the cabinet and there are eyes to
> attach to each piece of electronics you are controlling (these are easily mounted at the remote pickup on the front of each device as they come with
> sticky pads attached). Since I will be using a Satellite TV Receiver I will also require a piece of coax in order to connect a satellite dish to the
> receiver. I will run that coax to the rear of the coach and out through the storage area for easy connection. My choice of Satellite Dish is the
> Dish Network Tailgater. It receives its power through the coax so no need to run a separate wire. This dish is portable so you can set it up
> wherever you have a clear line of sight to the south and it receives all 3 satellites you need for both Standard as well as HD channels. The best
> part is it automatically finds the satellites for you so all you have to do is connect it to the satellite coax, set it on the ground or picnic table
> and turn your receiver on and get ready to watch tv. This I have found is not only cheaper than mounting a satellite on the roof of the coach but
> also keeps you from having to carry a second satellite dish due to when parking your coach and having trees blocking your satellite reception, this
> way all you have to do is set this satellite cube up with a clear line of sight to the south. The price is less than $400 for the cube so it is quite
> a bit less than most other dishes that mount on your rooftop..plus no holes in your roof...lol..Any questions just give me a shout. Thanks again,
> Glenn
> --
> Glenn W
> Topeka, KS
> 1974 GMC 26 ft. Desert Sand
> Side Bath
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Rob - Victoria, BC - 76 Royale - Rear Twins/Dry Bath

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Re: Stereo Wiring [message #253127 is a reply to message #253087]

Tue, 24 June 2014 12:13

roy1

Messages: 2126
Registered: July 2004
Location: Minden nevada

Karma: 6

Senior Member

The Majestic 12 volt TV DVD combo would be an excellent choice for a tv as it drawas only 1.6 amp at 12 volts not bad for a 21 1/2" TV. Also their omnidirectional 12 volt antenna claims 30 db gain which sounds good also. They would be my choice if I wasn't't already se up. The only drawback is the tv is a little pricier but you get what you pay for also it is supposed to have a higher gain tuner.

Roy Keen Minden,NV 76 X Glenbrook

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Re: Stereo Wiring [message #253131 is a reply to message #253127]

Tue, 24 June 2014 13:02

Otterwan

Messages: 946
Registered: July 2013
Location: Lynnwood (north of Seattl...

Karma: 0

Senior Member

On a related topic, my 76 Royale has a Sony CD player. Everything works correctly, balance, fade, etc. but it is not very loud. Maximum volume with the coach parked and the engine off is a comfortable listening volume. On the road you can barely hear anything. It has 6" Sony speakers in the rear appears to have stock speakers in the front. Any idea why this might be? My guess is it's just an old deck and should likely be replaced, but could it be something with the impedance of the old speakers?

1977 Birchaven, Lynnwood WA - "We may not be able to stop all evil in the world, but I know that how we treat one another is entirely up to us."

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Re: [GMCnet] Stereo Wiring [message #253132 is a reply to message #253131]

Tue, 24 June 2014 13:19

Guy Lopes

Messages: 499
Registered: April 2004
Location: Sacramento, CA

Karma: 3

Senior Member

David,

I'm no stereo expert so I have no advice other than substitution. Could you
swap in another speaker(s) in the front to see if that helps? I have to
tackle a new stereo installation as well, so I'm interested in your
findings.

Guy Lopes
76 Birchaven "Orion"
Sacramento, CA
W6TOL

www.GMC-Guy.com

-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of David Orders
Sent: Tuesday, June 24, 2014 11:03 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Stereo Wiring

On a related topic, my 76 Royale has a Sony CD player. Everything works
correctly, balance, fade, etc. but it is not very loud. Maximum volume with
the coach parked and the engine off is a comfortable listening volume. On
the road you can barely hear anything. It has 6" Sony speakers in the rear
appears to have stock speakers in the front. Any idea why this might be? My
guess is it's just an old deck and should likely be replaced, but could it
be something with the impedance of the old speakers?
--
1976 Royale "Twinkie II", 1978 Palm Beach with front end fire. Lynnwood WA -
"We may not be able to stop all evil in the world, but I know that how we
treat one another is entirely up to us."
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Guy Lopes 76 Birchaven "Orion" Sacramento, CA W6TOL www.GMC-Guy.com

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Re: Stereo Wiring [message #253133 is a reply to message #253131]

Tue, 24 June 2014 13:51

roy1

Messages: 2126
Registered: July 2004
Location: Minden nevada

Karma: 6

Senior Member

Otterwan wrote on Tue, 24 June 2014 11:02

On a related topic, my 76 Royale has a Sony CD player. Everything works correctly, balance, fade, etc. but it is not very loud. Maximum volume with the coach parked and the engine off is a comfortable listening volume. On the road you can barely hear anything. It has 6" Sony speakers in the rear appears to have stock speakers in the front. Any idea why this might be? My guess is it's just an old deck and should likely be replaced, but could it be something with the impedance of the old speakers?

Shouldn't be speaker impedance as auto speakers have bee 4 ohms like forever and they probably still are.

Roy Keen Minden,NV 76 X Glenbrook

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Re: Stereo Wiring [message #253175 is a reply to message #253127]

Tue, 24 June 2014 19:47

lotsofspareparts

Messages: 726
Registered: May 2014
Location: Arlington, WA

Karma: -9

Senior Member

roy1 wrote on Tue, 24 June 2014 10:13

The Majestic 12 volt TV DVD combo would be an excellent choice for a tv as it drawas only 1.6 amp at 12 volts not bad for a 21 1/2" TV. Also their omnidirectional 12 volt antenna claims 30 db gain which sounds good also. They would be my choice if I wasn't't already se up. The only drawback is the tv is a little pricier but you get what you pay for also it is supposed to have a higher gain tuner.

Wonder where that info for the TV came from......LOL

Jared

Jared & Tina Lazaron + 14yr old Daughter..... 77 Eleganza II "Recherché"..... 73 Canyon Lands 230 "Elephant"

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Re: Stereo Wiring [message #253177 is a reply to message #253133]

Tue, 24 June 2014 19:50

lotsofspareparts

Messages: 726
Registered: May 2014
Location: Arlington, WA

Karma: -9

Senior Member

roy1 wrote on Tue, 24 June 2014 11:51

Otterwan wrote on Tue, 24 June 2014 11:02
On a related topic, my 76 Royale has a Sony CD player. Everything works correctly, balance, fade, etc. but it is not very loud. Maximum volume with the coach parked and the engine off is a comfortable listening volume. On the road you can barely hear anything. It has 6" Sony speakers in the rear appears to have stock speakers in the front. Any idea why this might be? My guess is it's just an old deck and should likely be replaced, but could it be something with the impedance of the old speakers?

Shouldn't be speaker impedance as auto speakers have bee 4 ohms like forever and they probably still are.

Not true, I have seen 6 and 8 ohm car speakers in older vehicles. Depends on what the receiver was designed to put out.

You can test your OEM speakers with a multimeter set to OHMs.

Jared

Jared & Tina Lazaron + 14yr old Daughter..... 77 Eleganza II "Recherché"..... 73 Canyon Lands 230 "Elephant"

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Re: Stereo Wiring [message #253209 is a reply to message #253175]

Tue, 24 June 2014 23:15

roy1

Messages: 2126
Registered: July 2004
Location: Minden nevada

Karma: 6

Senior Member

lotsofspareparts wrote on Tue, 24 June 2014 17:47

roy1 wrote on Tue, 24 June 2014 10:13
The Majestic 12 volt TV DVD combo would be an excellent choice for a tv as it drawas only 1.6 amp at 12 volts not bad for a 21 1/2" TV. Also their omnidirectional 12 volt antenna claims 30 db gain which sounds good also. They would be my choice if I wasn't't already se up. The only drawback is the tv is a little pricier but you get what you pay for also it is supposed to have a higher gain tuner.

Wonder where that info for the TV came from......LOL

Jared

Google the majestic web site it is in their spec sheet. Low amp draw for dry camping is a plus in my book. My flat screen 17" Dell draws 4 amps at 12 volts.

Roy Keen Minden,NV 76 X Glenbrook

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Re: Stereo Wiring [message #253210 is a reply to message #253177]

Tue, 24 June 2014 23:22

roy1

Messages: 2126
Registered: July 2004
Location: Minden nevada

Karma: 6

Senior Member

lotsofspareparts wrote on Tue, 24 June 2014 17:50

roy1 wrote on Tue, 24 June 2014 11:51
Otterwan wrote on Tue, 24 June 2014 11:02
On a related topic, my 76 Royale has a Sony CD player. Everything works correctly, balance, fade, etc. but it is not very loud. Maximum volume with the coach parked and the engine off is a comfortable listening volume. On the road you can barely hear anything. It has 6" Sony speakers in the rear appears to have stock speakers in the front. Any idea why this might be? My guess is it's just an old deck and should likely be replaced, but could it be something with the impedance of the old speakers?

Shouldn't be speaker impedance as auto speakers have bee 4 ohms like forever and they probably still are.

Not true, I have seen 6 and 8 ohm car speakers in older vehicles. Depends on what the receiver was designed to put out.

You can test your OEM speakers with a multimeter set to OHMs.

Jared

You forgot 16 ohm just saying back in the day the run of the mill radios were mostly 4 ohm. I have 6 4 ohm speakers and 2 8 ohm speakers in my coach working off the same stereo

Roy Keen Minden,NV 76 X Glenbrook

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Re: Stereo Wiring [message #253211 is a reply to message #253087]

Tue, 24 June 2014 23:34

glenn2726

Messages: 234
Registered: June 2014
Location: Topeka, Kansas

Karma: 2

Senior Member

Going to pick up some wiring tomorrow and get started with the install. Hooked the stereo up this evening and works good, just needs speakers...lol And the tvs I'm using are both LEDs, a 40 inch in the living area and 22 in the back...don't dry camp but these are pretty energy efficient and light as well. But will be a bit before they are installed and connected to watch... lots more work to do... Glenn

Glenn W Topeka, KS 1974 GMC 26 ft. Color:Camel Interior:Canyon Land Side Bath, Rear Sitting Area

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Re: Stereo Wiring [message #253223 is a reply to message #253087]

Wed, 25 June 2014 06:41

jhbridges

Messages: 8412
Registered: May 2011
Location: Braselton ga

Karma: -74

Senior Member

Please remember, if you are using the stock GM (Delco) radio with one side of the speakers grounded, use ONLY the proper impedance speakers. For these radios, 10 Ohms, which is not a standard value. 4,8, or 16 Ohm speakers will not work well, and may fail the output transistors. GM used the speaker as the DC load for the output transistors, other impedances will upset the current balance. It did, however, save a capacitor and a resistor, maybe 50 cents per radio. Not a lot? How may cars did GM fit with radios through the 60s and 70s? Delco probably came out 10 - 20 million bux ahead. The designer pulled his weight in that boat.

--johnny
76 23' transmode norris
braselton ga

Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons. Braselton, Ga. I forgive them all, save those who hurt the dogs. They must answer to me in hell

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