Electronics Need help wiring something up? Thinking of adding an electrical component to your car? Need help troubleshooting that wiring glitch?

1990 Firebird Tail Light Wiring Harness Woes

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Old Nov 29, 2014 | 10:11 PM
  #1  
florida_gators's Avatar
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From: Odessa, FL
Car: 1990 Firebird
1990 Firebird Tail Light Wiring Harness Woes

My tail light bulbs starting blowing over and over, so I figured I'd swap out the harness. The ones from the junk yard had a connector from the rest of the wiring in the rear driver's side corner (in back of the plastic trim) as I pulled one from a 1989 and one from a 1991 not knowing which one I needed. When I went to remove my wiring harness, it doesn't appear to have this connector. The tail light harness splices to 3 areas: (1) the hatch motor/light - easy to remove, (2) the side marker light - easy to remove, and (3) along the entire driver's side length of the car (where the connector was on the 1989 and 1991 year cars to allow for easy removal but not my 1990). I followed the #3 splice, and it goes along the driver's side past the sail panel and under the carpeting in front of the rear driver's side seat. I quit following it at this point. Am I missing something? I really don't want to take apart my entire interior to remove this wiring harness.
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Old Dec 29, 2014 | 03:36 PM
  #2  
NINÅ's Avatar
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Joined: Jan 2006
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From: Mooresville NC
Car: LOWERED ♦ CRIMSON METALFLAKE
Engine: ► 400 KUBES ◄
Transmission: 765R4
Axle/Gears: EATON POSI 4.56
Wire Mire

You can use a 12 volt fused source to probe which wire illuminates which bulb.

Just connect ground to ground
(black wires in most cases) then using the + wire from the supply, touch the unknown wires.

When the bulb illuminates, attach a label to the wire.

As far as the car you’re working on, if there is no taillight assembly on it at this time, you can find out what wires illuminate what bulb by using a voltmeter or clip on lamp then label those wires.


Happy Racing !



We Keep The Air Wrench Shiny So It Looks Good When We Throw It Across The Pit Box

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