Diagnosing Brake Lights (Page 1/1)
tjoudrey AUG 05, 09:52 AM
I am in the process of restoring an 85 GT. My brake lights have appeared to have stopped working suddenly. The passenger side brake light will illuminate when the right blinker is engaged but otherwise the left blinker does not illuminate in the rear and the brake switch does not do anything. I have jumped the brake switch as a test and it did nothing.

What should I check next?
darbysan AUG 05, 10:39 AM
First I would check the fuse. If good, then it sounds like a ground issue. Don't have my manuals any more, so someone will have to jump in and help you trace the ground wire.
Patrick AUG 05, 02:20 PM

There is a ground for the rear lights in the passenger side rear wheel well. The plastic wheel well liner needs to be loosened to gain access. The ground is attached to upper frame rail, and often this ground fails due to corrosion of the rail.
theogre AUG 05, 04:26 PM
Check ground above.

Then See my Cave, Sneak Path and pull lights out fixers to what bulb filaments.
1 or more bulbs can have crap ground to side in the socket and to odd things and barely light in day time.

If rear lights have problems, front park/turn can have same problem and need work on the sockets too. (May turn on dash turn when parking light are on when front have sneak path problem.)
Front pulls out from back but need open hood and HL up.
Turn on HL, Disconnect HL motors, then turn off HL to get the park/turn sockets.

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