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90 Celica Brake lights on when turn on headlights


n2racing
01-02-2009, 12:39 PM
I have a customer that brought this in when he was pulled over by the police. The brake lights burn bright when turning on the headlights. When I unplug the the wiring harness at the left rear the right tail lamp lights up as regular tail lights the left turns off. The voltage at harness when tail light on is 10 wheras the voltage when the brake lights are on is 8.65. Really strange.
Any Help? Thanks.
jdmccright
01-16-2009, 11:18 PM
There's probably a short in the wiring harness going to the rear light assemblies...making the bright stop filaments to turn on instead of the dimmer ones in the bulbs when the headlights are turned on. Concentrate on where the loom might be constantly flexed from a door or hatchback opening & closing. Hope this helps!

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