91 firebird head light vs an 87 trans am headlight?

Question

I have a 91 firebird. It was my first sports car & first love. A few years back I cracked it up real bad and It has been sitting in my yard. A few months ago I found a 87 trans am for sale and I bought it with out the transmission or engine for cheep. The body is in real good shape. I planed on fixing the 91 firebird with the 87 trans Am, So I swapped the Trans Am suspension and body parts to the Firebird. Then I got to the head light on the driver side of the 91 fire bird, it has 4 wires that go to the light. The 87 Trans Am has a 3 prong plug that snaps in to the light. I need to use the Trans Am lights but am not sure what would happen if I were to splice the wires to the 3 prong plug. I would assume black goes to black, red to red, then I would be left with 2 yellow wires, I am not sure how to figure out which one to use other then process of elimination. Am I on the right track? Or should I just find a new light and place it in to the

"Head lights frame" and wire i like that?

Answer 1

Well common circuit is a 3 wire hookup that would consist of one common or ground wire and two hot wires bec the bulb is a dual bulb and has to levels high beam and low beam.So yes if a 4 wire hook up it make sense that if you connected the common to both wires that allow the bulbs to both work.

Simple test is try running wires to the dual bulbs and battery and see what wires are what or use a 12volt light test probe on the circuits.Plus due to the switchable source being a 12volts positive feed the ground wires shouldn't make any difference if two or 4 ground wires are being used.

Hope that helps and best of luck.By the way yes your on the right track.

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