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post #1 of 3 Old 12-09-2015, 09:38 AM Thread Starter
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LS Wiring Options

Which route should I take with wiring on my swap. I will be running a Holley setup with a 4L80. Do I yank the factory Mustang harness completely and start from scratch (using aftermarket harness), or is it better to leave the factory harness and splice each piece into it? I am assuming Painless, etc.. can make me a full harness ready to go?? What issues could I run into going either route?

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post #2 of 3 Old 12-14-2015, 03:50 AM
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I would use the factory body harness for all things not engine/trans related. Use Holley's harnesses for your efi. Get a copy of the Holley main harness wiring diagram. It us easy to figure out from there.


Dart 348ci, Ed Curtis cam/valvetrain, Precision 76mm, Holley Dominator EFI, CNP ignition, tons of Holler EFI small parts, 4"dp, 4R70W w/T-brake, new suspension coming soon.

Little 750rwhp at 6,000rpms and only 10lbs of boost before we just got tired of playing with clutches. New 4R70W and we are turning it up. Expecting 1,000rwhp.
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post #3 of 3 Old 12-15-2015, 12:33 PM Thread Starter
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Originally Posted by kbscobravert View Post
I would use the factory body harness for all things not engine/trans related. Use Holley's harnesses for your efi. Get a copy of the Holley main harness wiring diagram. It us easy to figure out from there.
Thanks for the reply! I was concerned about pulling the factory harness and ECU while breaking down the car. Didn't know how gentle to be with the wiring. I assumed I would need to cut down the harness to a bare minimum only retaining the needed items. I also want to hide the wiring, so I will need to extend some things. I didn't know if someone had a swap specific harness outside of the Holley harness to remove the frustration.
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