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07-18-2008, 08:25 PM | #1 |
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Location: Hudson New Hampshire
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Help with wire locations
Hi, I need some help with the location of where wires go through the firewall for a '77 K20.
What I need to know is: 1. backup switch for the 4 speed 2. Tachometer 3. Power Window 4. Aux battery I know that I can pretty much drill holes any place I want to but what fun would that be? Their are bumps in the firewall where holes should be so if someone could get me close that would be great. Thanks Rob |
07-21-2008, 04:54 PM | #2 |
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Location: Hudson New Hampshire
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Re: Help with wire locations
nobody knows ware the holes for the wires should be?
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07-21-2008, 05:14 PM | #3 |
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Location: Franklin Indiana
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Re: Help with wire locations
Sorry mines an 85. I could check it when I get home Friday and let you know where mine are.
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07-22-2008, 04:13 PM | #4 |
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Re: Help with wire locations
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07-22-2008, 06:20 PM | #5 |
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Re: Help with wire locations
I have a Chevy truck manual at home, I am on the road right know so I can't check it. I'll see if there are any pictures in it that show anything you have asked about. If they do I'll post pictures this week end.
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07-30-2008, 08:09 AM | #6 |
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Re: Help with wire locations
The book I have is an 82 but here is what I have found so far.
http://i38.photobucket.com/albums/e1...pwiring002.jpg I know it's not all you asked for but it is a start. It looks like most of the wiring comes through the firewall just below the wiper motor Last edited by 87Bob; 07-30-2008 at 08:11 AM. |
07-30-2008, 12:33 PM | #7 |
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Re: Help with wire locations
All of the wiring for the backup switch will come out of the fusebox.
I honestly don't remember where the tach lead comes out, but I believe it was the fusebox also The Dual battery won't go through the firewall The Power window don't go through it either, they go though the door frame. Plows were not installed on them by GM, so if you think it came from where you have it pictured, I would use it. I think the oil line is correct, but not 100% sure, the one labeled dual tanks is wrong.
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Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com |
07-30-2008, 01:28 PM | #8 | |
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Re: Help with wire locations
Quote:
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07-30-2008, 04:12 PM | #9 | |
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Join Date: Feb 2008
Location: Hudson New Hampshire
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Re: Help with wire locations
Quote:
In '77 and '78 the power window power came from the junction box under the hood with a 30 amp circuit breaker. The power lead has a grommet to go through the firewall. The plow I put on, I was just pointing out what the holes are for my reference. And the one for dual tanks, now I am really confused as that is the only hole in the other cab I have it could possibly fit? This would all be so much easer if the guy who "restored the cab" did the job correct. I have the whole cab stripped down to get sand blasted so I can not even test fit things to get an idea where they go now. And I would like to drill the holes before primer and paint Thank you for your help Rob |
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07-30-2008, 04:14 PM | #10 |
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Location: Hudson New Hampshire
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Re: Help with wire locations
87BOB what book is that? I really like the detail that it gives
Rob |
07-30-2008, 04:42 PM | #11 |
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Location: Franklin Indiana
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Re: Help with wire locations
It's the 82 Chevy shop manual. Need something else let me know I'll try to find it and shoot a picture of it.
Last edited by 87Bob; 07-30-2008 at 05:09 PM. |
07-30-2008, 08:27 PM | #12 |
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Location: Hudson New Hampshire
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Re: Help with wire locations
Here is the wire for the backup switch
The grey end goes to the transmission and the black end goes in the cab Rob |
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