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Old 01-10-2010, 12:34 PM
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79 C-10 Wiring diagram?

Hello,
I am looking for a wiring diagram for a 79 C-10, under hood and dash.
I used this harness in my 48 F-1 build and need to run down a few wires. I have the starting and charging system working along with lighting, just need to run down temp.,oil pressure, etc.. Also this harness came out of a six cylinder truck but I am running a 327, should not make much difference.
I know Docvette had posted this before but the info is no longer there, so if you can help thanks in advance.


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Old 01-10-2010, 01:04 PM
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Here ya go. It's from Haynes manual #420

Looks like TAN for oil sender, and DK GREEN for temp.
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Old 01-10-2010, 01:52 PM
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Thanks, I have searched high and low for this year model and only could find
everything in between! Now if this globel warming ever melts I will run these down and have this part of the project done, thanks again!
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Old 01-10-2010, 01:53 PM
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Glad to help.
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Old 01-13-2010, 05:58 PM
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if you need to know any other wires let me know, i know these old GM harnesses pretty well and have wired many up. they are pretty simple actually.

in 81 they added ESC/EST controls and a small ECM under the dash but it was separate harness from the main engine harness, still. but the HEI was different.
but the pink BATT wire to the HEi was still same since 1975 anyways.,.

V-8 and L-6 were same,
just different length wires and different locations of components is all..
but wired the same though.
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Old 01-13-2010, 07:00 PM
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I have all of the wiring diagrams as well.
Down to all of the independent harnesses-----just have to find them.
If you have a specific question on wire location---let us know.
I will be looking for that book here soon (about a 10 page book of diagrams for only the 79 trucks----includes pin and socket locations.).
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Old 01-17-2010, 08:59 AM
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Thanks for the info, one more question, since I am useing the 79 c-10 harness
am I stuck with the 79 instrument cluster or would something else interchange? I would hate to cut this harness up and if I have to then I will use the 79 cluster and just make the dash for it. The reason I ask is the 79 has that little curve to it and would have preferred something a little more flat.Thanks again!
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Old 01-17-2010, 12:51 PM
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No you're not stuck. On the back of the gauge cluster it's fairly easy to see where each wire on the plug leads to. As in, to each individual gauge. It's like a plastic flexible printed circuit board.

You new gauges must read the values from each engine sensor/sender properly. Unless you want to change them also.
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