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Old 03-19-2020, 09:23 AM   #243
MDPotter
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Re: 1968 GMC - Ol' Blue

Quote:
Originally Posted by rodstored-72 View Post
mdpotter,
Thanks for the reply. I guess what I am looking for is where the factory harness fan wires are located in the harness? I have the wiring diagrams for the engine, but I am trying to find the physical ends of the wires in the harness to connect the fan wires/relays to.You mention the fuel pump wires? are the wires for the fans in the same loom as the pump? I am expecting to see wire connector(s) for the fans somewhere in the harness all around the engine … IE: the connectors for the AC compressor … I promise I won't high jack your thread anymore.. sorry for the high jack. I like the progress you've made so far... very nice!!

thanks!!
No worries, I'm glad to help when I can. If you know where these wires are at the main PCM connectors, you can use a multimeter set to continuity ("beep") mode and put one lead on the pin at the PCM connector and then start hunting for the other ends. If your diagrams indicate a wire color, that helps too. I don't know as much about the Gen IV's unfortunately. We had Speartech rework my dad's harness but I did my Gen III.
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1964 Chevy C10 - Gen IV 5.3 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=768632
1968 GMC C15 - Gen III 6.0 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=772047
1969 Chevy C10 - Restoration http://67-72chevytrucks.com/vboard/s...d.php?t=809184
1978 Chevy Scottsdale K20
1993 Chevy C1500 - 5.3/T56 swapped
2008 Silverado Duramax
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