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Old 09-15-2017, 08:52 AM   #1
Bentbolt
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Wiring help

I bought this truck last weekend and been tinkering with it. I have no power to heater, wipers, gauge cluster, turn signals. It has after market switch for coil. The only thing in gauge cluster that works is speedo. All the fuses are good is it something simple or say buy new wiring kit?
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Old 09-15-2017, 09:14 AM   #2
The Rocknrod
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Re: Wiring help

The FAQ section has numerous wiring threads that I find helpful - Electrical Threads:
60-66 Wiring diagrams from Hilandr451 http://www.6066chevytrucks.com/index.html
60-66 Chevy - GMC wiring basics
60-66 full body wiring : December 2009 / Electrical forum
62' chevy c10 wiring diagram needed : May 2014
http://67-72chevytrucks.com/vboard/s...d.php?t=646002
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Old 09-15-2017, 12:56 PM   #3
Casey66
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Re: Wiring help

theastronaut did a great writeup on restoring a gauge cluster, http://67-72chevytrucks.com/vboard/s....php?p=5806390 .

As for the overall wiring, I'd say get a full new harness and install it. You'll know it's done right. American Autowire is what I used, https://www.americanautowire.com/sho...66-chevy-truck

Brothers Truck has a good series on rewiring a 67-72. Not exactly the same but close enough, https://www.youtube.com/watch?v=DNTgvJHSjx8
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Old 09-15-2017, 01:12 PM   #4
shp4man
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Re: Wiring help

Depending on how much abuse the original wiring has taken- as in burned up wiring from the non-fused ammeter or a previous owner that was an amateur sound system installer that destroyed the under dash wiring, which now looks like a bowl of colored spaghetti or other poorly done "repairs", the factory wiring in these trucks is surprisingly durable. It's possible to repair what's there if there's anything left (see above) and have a decent electrical system.
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Old 09-15-2017, 04:47 PM   #5
Wrenchbender Ret
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Re: Wiring help

If the wireing doesn't look cobbled, get a test light & start tracing. You may have a burned out fuseable link. Check the back of the ign. switch. They have a tendency to burn out wires in the connector. There is no use putting in a new harness if there is a simple fix.
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Old 09-15-2017, 05:01 PM   #6
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Re: Wiring help

I second the recommendation that you try to fix the original before buying a generic replacement. Installing an entire new harness isn't for the faint of heart.

Definitely buy a wiring diagram for the exact year of truck -- they sell 11x17 versions laminated in plastic that are perfect for using while you work.

With only a dozen or so circuits in the entire truck, it's pretty easy to track down any issues. My electrics were all failed when I bought my 'burb. Most of the problems turned out to be corrosion in connectors or ground wires.

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Old 09-15-2017, 08:09 PM   #7
rvrfoot
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Re: Wiring help

I would start with one thing at a time. trying to pin point the problem.
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Old 09-15-2017, 08:26 PM   #8
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Re: Wiring help

If they wired the ignition off a stray hot and just to the coil none of the stuff you listed will work. I would look at what they did with the switch that is in it and start from there. While you are looking around under the dash its a good time to evaluate the condition of the harness and get rid of any wires that dont go anywhere.
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Old 09-18-2017, 10:15 AM   #9
Bentbolt
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Re: Wiring help

thanks, yes the switch is gone and the new coil wire id straight from the battery. where do you buy the 11x17 versions laminated copies at?
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Old 09-18-2017, 10:34 AM   #10
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Re: Wiring help

This site has 11x17 and bigger!

http://kwikwire.com/chevrolet-wiring...inated-poster/
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Old 09-18-2017, 10:36 AM   #11
Bentbolt
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Re: Wiring help

Thanks
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