yj wiring harness thinning - JeepForum.com

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post #1 of 6 Old 02-20-2012, 08:05 PM Thread Starter
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1991 YJ Wrangler 
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yj wiring harness thinning

im swapping in a sbc 350. my question is i need to thin the harness out. now can i just cut the old pcm harness off and be done with it, or is there more to it that??

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post #2 of 6 Old 02-21-2012, 06:27 AM Thread Starter
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bump! cmon people. i need some help!
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post #3 of 6 Old 02-21-2012, 06:33 AM
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i hope someone answers this, but i have not received many answers to electrical questions either.
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post #4 of 6 Old 02-21-2012, 07:00 AM
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You can cut out any wiring that isn't used by the engine/gauges/fuel or charging systems.

Ie is you're not using the factory computer for anything there is no need to keep it in the jeep.

You can keep things easier by repurposing some of the wiring and sensors if you're trying to integrate your factory gauges.

Its really all up to you what your keep and remove. There is no magic answer.

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post #5 of 6 Old 02-21-2012, 10:31 AM
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Are you keeping the stock gauge's? Is the sbc fuel injected?
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post #6 of 6 Old 02-21-2012, 10:43 AM
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Obviously the old computer is not going to be of any use with a new engine. If you want a clean harness trace each wire from the ECM connector and remove it, along with whatever is connected on the other end. Or, find the wires you want to keep for the gauge senders, lights, the starting and charging circuits and cut out everything else.

Sort of like this.

And don't be so impatient. 7pm til 5am is not exactly prime time.

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