Home » Public Forums » GMCnet » Electrical gremlins, charging set up, and questions
| Re: [GMCnet] Electrical gremlins, charging set up, and questions [message #310577 is a reply to message #310570] |
Fri, 18 November 2016 15:43   |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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You want the right part call us as we stock all.
On Fri, Nov 18, 2016 at 12:01 PM, Adam Metzger
wrote:
> My morning coffee cup update-
>
> The red DIODE wire is indeed the wire that runs through the loom, across
> the top of the engine, and to the alternator. it is currently connected to
> the other wire running to the relay with the green fusible link
> correctly. unfortunately, the other end is utter shite. baked hard and
> covered in
> masses of electrical tape.
>
> http://s66.photobucket.com/user/adammetzger/media/engine%
> 20top%201.jpg.html
>
> http://i66.photobucket.com/albums/h252/adammetzger/engine%20top%201.jpg
>
>
> http://s66.photobucket.com/user/adammetzger/media/alt%20wire%201.jpg.html
>
> http://i66.photobucket.com/albums/h252/adammetzger/alt%20wire%201.jpg
>
> old fly tying scissors are pretty good for cutting through this crap.
> Why would someone double up the wire running from a single wire to a
> single terminal? Is this a thing?
>
> http://s66.photobucket.com/user/adammetzger/media/engine%
> 20top%202.jpg.html
> http://i66.photobucket.com/albums/h252/adammetzger/engine%20top%202.jpg
>
> in unwrapping about 6 feet of old crusty electric tape, I found a
> suprise. A dk blue wire, cut at both ends, and wrapped up like a mummy.
> any
> ideas? runs to engine compartment, near battery?
>
> BTW, that's the white wire that comes out of the ALT harness.
>
> 40 year old white male wire seeks alternator lifestyle for good times. 8)
>
>
> http://s66.photobucket.com/user/adammetzger/media/alt%
> 20wire%20pigtail.jpg.html
>
> I found a dorman replacement part for this, GMC from 73 to 90 something.
> the only concern is the wire gauge is smaller on the replacement. any
> issues? Should I pull it apart and use new wire correct gauge wire into
> the new part??
>
> ideas?
>
> Thanks fellas. I was TERRIFIED about the prospect of tearing into engine
> wiring. but alas, there are really only SO MANY wires, right?
>
> thanks for the encouragement.
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> --
> 1976 Palm Beach
> Austin, TX
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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>
--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] Electrical gremlins, charging set up, and questions [message #310583 is a reply to message #310577] |
Fri, 18 November 2016 17:13 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
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Senior Member |
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Be are to label EVERY wire you touch
On Fri, Nov 18, 2016 at 1:44 PM Jim Kanomata wrote:
> You want the right part call us as we stock all.
>
>
> On Fri, Nov 18, 2016 at 12:01 PM, Adam Metzger
> wrote:
>
>> My morning coffee cup update-
>>
>> The red DIODE wire is indeed the wire that runs through the loom, across
>> the top of the engine, and to the alternator. it is currently connected
> to
>> the other wire running to the relay with the green fusible link
>> correctly. unfortunately, the other end is utter shite. baked hard and
>> covered in
>> masses of electrical tape.
>>
>> http://s66.photobucket.com/user/adammetzger/media/engine%
>> 20top%201.jpg.html
>>
>> http://i66.photobucket.com/albums/h252/adammetzger/engine%20top%201.jpg
>>
>>
>>
> http://s66.photobucket.com/user/adammetzger/media/alt%20wire%201.jpg.html
>>
>> http://i66.photobucket.com/albums/h252/adammetzger/alt%20wire%201.jpg
>>
>> old fly tying scissors are pretty good for cutting through this crap.
>> Why would someone double up the wire running from a single wire to a
>> single terminal? Is this a thing?
>>
>> http://s66.photobucket.com/user/adammetzger/media/engine%
>> 20top%202.jpg.html
>> http://i66.photobucket.com/albums/h252/adammetzger/engine%20top%202.jpg
>>
>> in unwrapping about 6 feet of old crusty electric tape, I found a
>> suprise. A dk blue wire, cut at both ends, and wrapped up like a mummy.
>> any
>> ideas? runs to engine compartment, near battery?
>>
>> BTW, that's the white wire that comes out of the ALT harness.
>>
>> 40 year old white male wire seeks alternator lifestyle for good times.
> 8)
>>
>>
>> http://s66.photobucket.com/user/adammetzger/media/alt%
>> 20wire%20pigtail.jpg.html
>>
>> I found a dorman replacement part for this, GMC from 73 to 90 something.
>> the only concern is the wire gauge is smaller on the replacement. any
>> issues? Should I pull it apart and use new wire correct gauge wire into
>> the new part??
>>
>> ideas?
>>
>> Thanks fellas. I was TERRIFIED about the prospect of tearing into engine
>> wiring. but alas, there are really only SO MANY wires, right?
>>
>> thanks for the encouragement.
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> --
>> 1976 Palm Beach
>> Austin, TX
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
>
>
>
> --
> Jim Kanomata
> Applied/GMC, Fremont,CA
> jimk@appliedairfilters.com
> http://www.appliedgmc.com
> 1-800-752-7502
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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| Re: Electrical gremlins, charging set up, and questions [message #310594 is a reply to message #310570] |
Sat, 19 November 2016 02:43 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
|
Senior Member |
|
|
You need to closely look at the wiring diagram. The circuit for the red 12 ga wire on the horn relay terminal goes 3 places:
1. To the inside fuse box
2. To ignition switch
3. To the white wire on the alternator plug.
The white wire on the alternator plug (item 3 above) is a remote voltage sensing line for the alternator. It moves very little current. I believe the only reason GM used 12 ga. there was because the white wire was meeting the two other 12 ga. wires Items 1 and 1 above) that do carry most of the current (other than the starter) used in the engine side of the coach.
That white wire going to the alternator plug is NOT the wire carrying the current generated by the alternator and supplied to the center terminal of the isolator.
The wire carrying alternator power to the isolator center terminal is a heavier 10 ga. RED one. It has single ring terminal on it and it is mounted on a stud on the back side of the alternator.
I have no idea what this PO was trying to do here.
I am suggesting that you leave that white wire circuit and red wire at the horn relay wire alone for now. You can go back and clean it up later.
On you original problem, You need to find the 10 ga. wire connected on the single terminal on the back of the alternator and chase it down. It is the one supplying ALL charging power to the Isolator and the coach and should be mounted to the center terminal of the isolator.
I'll repeat. The white wire in the alternator plug is a voltage sense line only.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
[Updated on: Sun, 20 November 2016 06:38] Report message to a moderator |
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| Re: Electrical gremlins, charging set up, and questions [message #310606 is a reply to message #310594] |
Sat, 19 November 2016 11:20 |
Atom Ant
Messages: 170
Registered: October 2016
Location: Austin, TX
Karma: 0
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Senior Member |
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Hi Ken-
Thanks for your input. I understand that the red wire is the power wire, and it runs from the ALT to the isolator. My PO had run a different alternator wire, but had it tied into a bunch of superfluous connections as well. This is all an attempt to clean up the more offensive wiring practices.
in tracing the coaches original red wire, I found the white and brown ALT wires also in poor health. I have clipped the original pigtail, and am replacing it, and will clean up the connections with either crimps, or solder, and shrinkwrap.
I have run a NEW wire to ALT to the positive junction, as that is how PO had it. I'm trying to get the wiring straight so I can incorporate the isolator, and in the meantime replace any major wiring issues that may cause me harm down the road.
I'm confused by "circuit forred" that you typed. I think this is a mis type, but cannot reason out what you meant. Sorry If I'm being dense.
1976 Palm Beach
Austin, TX
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| Re: [GMCnet] Electrical gremlins, charging set up, and questions [message #310626 is a reply to message #309978] |
Sun, 20 November 2016 02:18 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
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Senior Member |
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Read here
http://gmcmotorhome.info/APC.html
On Sun, Nov 20, 2016 at 12:13 AM gene Fisher wrote:
> Be sure to plug in an APC wire into your alternator for protection
> Click on my tag line for more info
>
>
> On Sat, Nov 19, 2016 at 9:21 AM Adam Metzger
> wrote:
>
> Hi Ken-
>
> Thanks for your input. I understand that the red wire is the power wire,
> and it runs from the ALT to the isolator. My PO had run a different
> alternator wire, but had it tied into a bunch of superfluous connections
> as well. This is all an attempt to clean up the more offensive wiring
> practices.
>
> in tracing the coaches original red wire, I found the white and brown ALT
> wires also in poor health. I have clipped the original pigtail, and am
> replacing it, and will clean up the connections with either crimps, or
> solder, and shrinkwrap.
>
> I have run a NEW wire to ALT to the positive junction, as that is how PO
> had it. I'm trying to get the wiring straight so I can incorporate the
> isolator, and in the meantime replace any major wiring issues that may
> cause me harm down the road.
>
> I'm confused by "circuit forred" that you typed. I think this is a mis
> type, but cannot reason out what you meant. Sorry If I'm being dense.
> --
> 1976 Palm Beach
> Austin, TX
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
>
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| Re: [GMCnet] Electrical gremlins, charging set up, and questions [message #310627 is a reply to message #310606] |
Sun, 20 November 2016 02:13 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
|
Senior Member |
|
|
Be sure to plug in an APC wire into your alternator for protection
Click on my tag line for more info
On Sat, Nov 19, 2016 at 9:21 AM Adam Metzger wrote:
> Hi Ken-
>
> Thanks for your input. I understand that the red wire is the power wire,
> and it runs from the ALT to the isolator. My PO had run a different
> alternator wire, but had it tied into a bunch of superfluous connections
> as well. This is all an attempt to clean up the more offensive wiring
> practices.
>
> in tracing the coaches original red wire, I found the white and brown ALT
> wires also in poor health. I have clipped the original pigtail, and am
> replacing it, and will clean up the connections with either crimps, or
> solder, and shrinkwrap.
>
> I have run a NEW wire to ALT to the positive junction, as that is how PO
> had it. I'm trying to get the wiring straight so I can incorporate the
> isolator, and in the meantime replace any major wiring issues that may
> cause me harm down the road.
>
> I'm confused by "circuit forred" that you typed. I think this is a mis
> type, but cannot reason out what you meant. Sorry If I'm being dense.
> --
> 1976 Palm Beach
> Austin, TX
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
_______________________________________________
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Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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| Re: Electrical gremlins, charging set up, and questions [message #310629 is a reply to message #310606] |
Sun, 20 November 2016 06:57 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
|
Senior Member |
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OK, on the confusion. I am a terrible typist and I always have to re-read and correct my postings before pressing send. I still miss some errors as you have seen. I corrected / updated that posting. Let's see if it is understandable now.
http://gmc.mybirdfeeder.net/GMCforum/index.php?t=tree&goto=310594&rid=12#page_top
I think we are on the the same page here on the white wire at the alternator. I thought you were chasing the lead to the isolator and had it confused with the white voltage sense wire. I now see that I was mistaken.
BTW,
If I do not state something clearly, feel free to ask again. If I make a mistake like I did with the blower and horn relays earlier in this thread, please correct it. You will not hurt my feelings.
If you want to talk about this on the phone, feel free to look up my unlisted home phone number on the GMC BLACK LIST. If you get voice mail and decide to leave a message, please speak slowly and repeat any numbers twice.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Electrical gremlins, charging set up, and questions [message #310653 is a reply to message #310629] |
Sun, 20 November 2016 12:46 |
Atom Ant
Messages: 170
Registered: October 2016
Location: Austin, TX
Karma: 0
|
Senior Member |
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Ken Burton wrote on Sun, 20 November 2016 06:57OK, on the confusion. I am a terrible typist and I always have to re-read and correct my postings before pressing send. I still miss some errors as you have seen. I corrected / updated that posting. Let's see if it is understandable now.
http://gmc.mybirdfeeder.net/GMCforum/index.php?t=tree&goto=310594&rid=12#page_top
I think we are on the the same page here on the white wire at the alternator. I thought you were chasing the lead to the isolator and had it confused with the white voltage sense wire. I now see that I was mistaken.
BTW,
If I do not state something clearly, feel free to ask again. If I make a mistake like I did with the blower and horn relays earlier in this thread, please correct it. You will not hurt my feelings.
If you want to talk about this on the phone, feel free to look up my unlisted home phone number on the GMC BLACK LIST. If you get voice mail and decide to leave a message, please speak slowly and repeat any numbers twice.
Thanks Ken! any input on replacing part of a wire vs the entire thing? Id like to replace all three alt wires at least to the other side of the engine bay, as they're all pretty crusty. My concern is that if I take em all the way back to the OEM wiring splices, I'm going to get the bug to replace all of them. I found a replacement ALT harness with the correct wire sizing, and I have to replace some of the wire as the new pigtail is too short.
1976 Palm Beach
Austin, TX
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| Re: Electrical gremlins, charging set up, and questions [message #310695 is a reply to message #310653] |
Mon, 21 November 2016 01:00 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
|
Senior Member |
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First get an APC (Alternator Protection Cable) from Gene Fischer and add it to the alternator end of your new cable. You really should have one plugged on to that cable anyway and it will add 6" to the cable length.
You can get just the connector without the wires already crimped on it. I had an extra one around here but I can not find it. I'll keep looking for it. Gene Fischer might have one as he uses them to make the APC's.
I'm headed out the door right now so I'll respond some more to the rest of your posting when I return.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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