the donor car is a 1987 fiero do u have to change the wiring harness to hook up the new lights?

yes

it has been done without changing the harness, but there is a lot of cutting and splicing involved..... It is actually easier in my opinion to change out the harness.
Rich

MUCH easier to change out the wiring harness as well. It is a quick and easy job if you swap in the Gen II harness, and only a single plug on the front "firewall".

I modified my harness, was not hard to do, just followed the instructions by Dodgerunner, you can find these in the Ogres cave, at the time I did not have a harness available to swap, just motors and a module, works great.

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84SE, aero body, 4 speed and an injected 355 V8

84 w/ AC means 2 speed radiator fan.
Switch whole harness to 87 means losing that to 1 speed. Likely need 87 fan w/o cutting wires.

See my Cave, Gen 2 HL Motor

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Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)

The Ogre's Fiero Cave

I did the entire harness. Very simple other than routing the wires under rad shroud. Tight area.

quote Originally posted by Spiders1: I did the entire harness. Very simple other than routing the wires under rad shroud. Tight area.

Agreed.... worst part of the whole process!!