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Engine swappers who have removed the factory wiring harness, how did you wire your headlights and side markers?


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#1 BrycexD

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Posted 30 April 2021 - 11:30 AM

Working on swapping my 87 conquest and we removed the engine bay wiring harness and we cannot seem to think of an easy way to run wiring back to the existing lights. Any ideas?





#2 tux

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Posted 30 April 2021 - 12:04 PM

There is a separate body harness from the engine harness, leave the body harness alone.  Unless you want to rewire.

If you want to rewire the body, might want to look into something like this https://www.ecumaste...m/products/pmu/

Edited by tux, 30 April 2021 - 12:05 PM.


#3 kev

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Posted 30 April 2021 - 01:29 PM

As stated above, the engine harness is separate from the body harness.  You want to retain the entire body harness.    

There are a few wires potentially needed in the engine harness as well.  The wire to the alternator solenoid and the coolant temperature switch/oil pressure gauges (if you are retaining the factory gauges in the cluster)

#4 BrycexD

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Posted 30 April 2021 - 04:49 PM

So the wiring harness in my car isnít fully removed but had to be cut due to some damage. Would it be possible to reconnect some of the wires that are going to the lights and supply them with power to make everything function again?

#5 BrycexD

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Posted 30 April 2021 - 04:53 PM

https://imgur.com/a/Mhu24LO

Theres a link to a picture of what Im working with

Edited by BrycexD, 30 April 2021 - 04:54 PM.


#6 Turbo Cary

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Posted 30 April 2021 - 05:32 PM

Get yourself a Painless Wiring Harness kit. You'll be getting rid of your crappy OE fuse box and fuse link system in favor of new, corrosion free setup.

It will be more work but worth it in the end.

#7 scott87star

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Posted 30 April 2021 - 06:23 PM

Anything is possible but putting all of your wire splices in the same spot will triple the diameter of that spot and look stupid.  Pull the rest out and decide what you can do.
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#8 scott87star

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Posted 30 April 2021 - 06:23 PM

Anything is possible but putting all of your wire splices in the same spot will triple the diameter of that spot and look stupid.  Pull the rest out and decide what you can do.
Now selling true plug and play megasquirt!  Absolutely the best value in stand alone ECU's out there.

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#9 tux

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Posted 30 April 2021 - 10:48 PM

Oh jeez, I'd go the pmu route at this point

#10 BrycexD

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Posted 01 May 2021 - 09:31 AM

Thanks for the feedback. I planned on using a painless wiring kit for my engine components so I will most likely be going that route.

#11 Fuze

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Posted 10 May 2021 - 01:49 PM

You also are going to want to terminate all the wires you're not pulling out, having them cut like that with open ends is a really bad idea. If you have the wiring diagram, you can find the lights, there's only a few wires, but it looks like you cut the harness before the fuse block and relays so...

I just rewired all the lights in my car, it's a process but they're not complicated circuits.

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