Home » Public Forums » GMCnet » Two newb questions
| Two newb questions [message #321222] |
Fri, 28 July 2017 20:39  |
gibsongo
Messages: 116
Registered: October 2012
Location: Montreal West, Quebec, Ca...
Karma: 0
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Hello all,
The Moneypit runs - finally. I put about 500 miles on it last week and all the mechanicals seem to be running well. Elkhart here I come!!!
Now its time to have a bit of a go at the interior. The driver and passenger ceiling lights aren't working, and I thought this would be a quick fix - the bulbs in each are blown. Of course the bulbs are a bit strange - not sure I've anything similar at the local parts store. But just to make sure the there weren't any further problems, I measured voltage at the bulb sockets. Yep - there's current......but my VOM reads 18.5 volts. I unplugged shore power, same thing - 18.5 volts. How do you get 18.5 volts from 2 6-volt golf cart batteries?
Second question: I put a Sony double DIN radio in - 55 watts of power per channel for 4 channels. I have the standard 3.5" front speakers in the panel with the above-mentioned lights, and a pair of 5 x 7.5" speakers in approx 2 cubic foot boxes in the living compartment about 6 feet back. I was planning to upgrade the drivers in these in the hopes of improving the sound somewhat. Any good suggestions for the 3.5" cockpit speakers?
Thanks
Gordon
Gordon Gibson
1976 23" Norris Upfit
Montreal West, Quebec, Canada
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| Re: Two newb questions [message #321226 is a reply to message #321224] |
Fri, 28 July 2017 21:42  |
gibsongo
Messages: 116
Registered: October 2012
Location: Montreal West, Quebec, Ca...
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Bruce
No charger connected. The house and engine batteries are connected by a combiner though. I'll check the VOM tomorrow, but it was fine a week ago.
Thanks
Gordon
Gordon Gibson
1976 23" Norris Upfit
Montreal West, Quebec, Canada
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| Re: Two newb questions [message #321229 is a reply to message #321226] |
Fri, 28 July 2017 23:34 |
Bullitthead
Messages: 1411
Registered: November 2013
Karma: 5
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Maybe somehow your chassis battery positive is connected to the junction between the two 6 volt batteries.
Terry Kelpien
ASE Master Technician
73 Glacier 260
Smithfield, Va.
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| Re: Two newb questions [message #321230 is a reply to message #321229] |
Fri, 28 July 2017 23:37 |
Bullitthead
Messages: 1411
Registered: November 2013
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That would give you 18.6 volts and the ground connection for one of the 6 volt batteries would have to be disconnected.
Terry Kelpien
ASE Master Technician
73 Glacier 260
Smithfield, Va.
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| Re: Two newb questions [message #321231 is a reply to message #321230] |
Sat, 29 July 2017 02:54 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Bullitthead wrote on Fri, 28 July 2017 23:37That would give you 18.6 volts and the ground connection for one of the 6 volt batteries would have to be disconnected.
I like that thought.
I have been trying to come up with a failure scenario with no alternator or converter running. My only explanation was the meter is bad.
Your guess is a good one.
Maybe he should check the cabling on all batteries (house and engine) for proper connections.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Two newb questions [message #321236 is a reply to message #321222] |
Sat, 29 July 2017 08:58 |
Scott Nutter
Messages: 782
Registered: January 2015
Location: Houston/San Diego
Karma: 4
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Gordon,
There was a pretty good thread on stereos a few days ago.
Alpine has a round 4inch speaker that should fit in there. About $50 US on Amazon. Crutchfield also has 4x6 inch speakers that will fit but you will have to mod the panel insert.
My panel insert is cracking at the corners, so im going to get a thin piece of wood and cut it to fit and make that my overhead panel insert. Then I'm going to try to get a pair of Alpine 5x7 speakers to fit into the wood. If the Alpine is too wide, then I'm going with a 4x6.
Then there's the light........applied has screw on lights.
Good luck,
Scott
Scott Nutter
1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21 final drive, Quad bags, Dave Lenzi super duty mid axle disc brakes, tankless water heater, everything Lenzi. Alex Ferrera installed MSD Atomic EFI
Houston, Texas
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| Re: Two newb questions [message #321250 is a reply to message #321222] |
Sat, 29 July 2017 15:16 |
Scott Nutter
Messages: 782
Registered: January 2015
Location: Houston/San Diego
Karma: 4
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Gordon,
I just got back from the GMC, and measured again. The 5x7's won't work..............too wide.
So I think the widest you can put in the overhead is a 4x6 or round 4inch speaker..
Scott.
Scott Nutter
1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21 final drive, Quad bags, Dave Lenzi super duty mid axle disc brakes, tankless water heater, everything Lenzi. Alex Ferrera installed MSD Atomic EFI
Houston, Texas
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| Re: Two newb questions [message #321262 is a reply to message #321222] |
Sat, 29 July 2017 20:04 |
ree_eric
Messages: 43
Registered: February 2004
Location: Alexandria, Ontario, Cana...
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I put 2 modern 4" speakers, 4 holes have to be drilled in the plastic to secure them and they look fine.
Eric & Ree '74 ex-Sequoia (parts) '75 Eleganza (TB, exhaust x-over blocking plates, Manny reaction arms and discs, 3"exhaust rear muffler, aux vacuum, fuel tank sealing, rebuilt senders and new rubber, propane hot water heater.) Alexandria, Ontario, Canada
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| Re: Two newb questions [message #321328 is a reply to message #321231] |
Sun, 30 July 2017 19:28 |
gibsongo
Messages: 116
Registered: October 2012
Location: Montreal West, Quebec, Ca...
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How embarassing....
Two shorted segments in the digital VOM's readout and a 13 turns into an 18 (when plugged into shore power the chassis and house batteries are reading aboutg 13.4 volts. Next time I will be a bit more careful before claiming that the sky is falling.
But I guess one stupid guestion fosters another. The switch controlling the light above the passenger and driver is three position - center, up and down. I assumed center would be off - and there is no voltage to the bulb socket in this position, so I guess that is right. In one of the two "on" positions I see coach battery voltage, and in the other, 0 volts. So what exactly is this second "on" position for?
In terms of the speakers, I am trying to keep the front cap unmolested just in case I want to sell to a purist on down the road. SO I found some Polk 4" 2-way drivers to replace the 3.5" ones. Better...but not by a lot. Saw the Bounds video, but he didn't mention a brand for his replacement drivers (although $25 each sounds like a great deal - half the price of the Polks). So I will beef up the 5 x 7" two way drivers in the add-on cabinets in the front living compartment to hopefully add a little more bottom.
Thanks to all.
Gordon
Gordon Gibson
1976 23" Norris Upfit
Montreal West, Quebec, Canada
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| Re: [GMCnet] Two newb questions [message #321333 is a reply to message #321328] |
Sun, 30 July 2017 19:58 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Gordon,
The cockpit overhead lights can be either ON, OFF, or AUTO-EntryDoor.
Ken H.
On Sun, Jul 30, 2017 at 8:28 PM, Gordon Gibson
wrote:
> How embarassing....
> Two shorted segments in the digital VOM's readout and a 13 turns into an
> 18 (when plugged into shore power the chassis and house batteries are
> reading aboutg 13.4 volts. Next time I will be a bit more careful before
> claiming that the sky is falling.
>
> But I guess one stupid guestion fosters another. The switch controlling
> the light above the passenger and driver is three position - center, up and
> down. I assumed center would be off - and there is no voltage to the bulb
> socket in this position, so I guess that is right. In one of the two "on"
> positions I see coach battery voltage, and in the other, 0 volts. So what
> exactly is this second "on" position for?
>
> In terms of the speakers, I am trying to keep the front cap unmolested
> just in case I want to sell to a purist on down the road. SO I found some
> Polk
> 4" 2-way drivers to replace the 3.5" ones. Better...but not by a lot. Saw
> the Bounds video, but he didn't mention a brand for his replacement drivers
> (although $25 each sounds like a great deal - half the price of the
> Polks). So I will beef up the 5 x 7" two way drivers in the add-on
> cabinets in
> the front living compartment to hopefully add a little more bottom.
>
> Thanks to all.
>
> Gordon
> --
> Gordon Gibson
> 1976 23" Norris Upfit
> Montreal West, Quebec, Canada
>
> _______________________________________________
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: Two newb questions [message #321337 is a reply to message #321222] |
Sun, 30 July 2017 20:11 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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The headlight switch when rotated turns on the courtesy lights in the other away from center position.
Try Crutchfield or Retrosound for sourcing car speakers. No matter what you put up n the 3.5"overheads they are fatiguing due to position and size.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: [GMCnet] Two newb questions [message #321352 is a reply to message #321328] |
Sun, 30 July 2017 21:35 |
Emery Stora
Messages: 959
Registered: January 2011
Karma: 4
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In some GMCs the light comes on when the door is opened. I believe that was earlier models.
On my 1977 when the light switch is in one of the on positions the headlight switch (which controls dimming of the dash lights) will turn on the overhead lights if the headlight switch is rotated all the way.
Emery Stora
77 Kingsley
Frederick, CO
> On Jul 30, 2017, at 6:28 PM, Gordon Gibson wrote:
>
> How embarassing....
> Two shorted segments in the digital VOM's readout and a 13 turns into an 18 (when plugged into shore power the chassis and house batteries are
> reading aboutg 13.4 volts. Next time I will be a bit more careful before claiming that the sky is falling.
>
> But I guess one stupid guestion fosters another. The switch controlling the light above the passenger and driver is three position - center, up and
> down. I assumed center would be off - and there is no voltage to the bulb socket in this position, so I guess that is right. In one of the two "on"
> positions I see coach battery voltage, and in the other, 0 volts. So what exactly is this second "on" position for?
>
> In terms of the speakers, I am trying to keep the front cap unmolested just in case I want to sell to a purist on down the road. SO I found some Polk
> 4" 2-way drivers to replace the 3.5" ones. Better...but not by a lot. Saw the Bounds video, but he didn't mention a brand for his replacement drivers
> (although $25 each sounds like a great deal - half the price of the Polks). So I will beef up the 5 x 7" two way drivers in the add-on cabinets in
> the front living compartment to hopefully add a little more bottom.
>
> Thanks to all.
>
> Gordon
> --
> Gordon Gibson
> 1976 23" Norris Upfit
> Montreal West, Quebec, Canada
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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| Re: [GMCnet] Two newb questions [message #321384 is a reply to message #321342] |
Mon, 31 July 2017 08:08 |
rod utterback
Messages: 18
Registered: April 2016
Karma: 1
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Hi
Gordon, I’ve been reading all the comments regarding speakers. I recently made a major upgrade to my system. And offer to pass on my struggle (I mean information learned). Please read this with reservation, I’ve found because of production changes and wild POs changes, things can vary greatly. This is just what I did. Although I was once told I didn’t do it because I didn’t offer pics.
I spent a lot time on research in person and on line to try to find a substitute speaker for the cockpit. With the mounting points and shallow depth I cant see how anything larger the a 3.5 inch will fit. 3 inch are non existent. No on a 4 inch. Keep the factory look. It’s a better way, usually takes more time and money to return to original when you’ve tired of the look later, looks integrated into the couch, and I think represents a greater value in the long term. In San Diego we have a supplier named Fry’s Electronics ( outpost.com). You can order online and they can provide a quality high power speaker that fits both your cockpit size and the rear compartment 4x6 with the use of a speaker mounting board. All out of sight with no visible sign of chopping the interior. Stealth is the way to go.
The seat pedestals make a great place for 6 x 9 multi driver speakers for fill. They can be full range but I prefer disabling the tweeter and crossing over at least 60 hz. The cockpit speakers should be crossed-over at 180 hz. They are too small for anything else and are used for stage presence imaging . Then dedicate one of the lower storage compartments for subwoofer drivers. Add quality amps and a little tuning and you are done.
The rest of my mods were electronics ( amps, double din, wifi, Bluetooth, gps, etc,etc)
Good luck with what ever you chose.
Rod Utterback
1973 canyonlands 26 ft mucho mods
Escondido, Ca.
From: Gordon Gibson
Sent: Sunday, July 30, 2017 6:45 PM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Two newb questions
Aaaah - makes a lot of sense. Thanks.
Gordon
--
Gordon Gibson
1976 23" Norris Upfit
Montreal West, Quebec, Canada
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| Re: Two newb questions [message #321494 is a reply to message #321222] |
Tue, 01 August 2017 15:59 |
Scott Nutter
Messages: 782
Registered: January 2015
Location: Houston/San Diego
Karma: 4
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And the 4x6 speakers that Matt used can still be bought at crutchfields.
Pioneer TS-A4676R. 4"x6" 3 way speakers. $79.99. Gets 5 out 5 stars.
Scott Nutter
1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21 final drive, Quad bags, Dave Lenzi super duty mid axle disc brakes, tankless water heater, everything Lenzi. Alex Ferrera installed MSD Atomic EFI
Houston, Texas
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