Question about Toyota Supra

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Brake lights wont work on 1987 toyota supra, replaced bulbs , checked fuses, replaced brake switch and adjusted according to haynes manual. Have the entire interior torn out from fuse panel to rear. All other lights wo0rk not brakes.Please help,

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  • william cook Jul 28, 2010

    THANK-YOU VERY MUCH AS SOON AS I TIGHTENED AND CLEANED THE GROUNDS ON THE REAR WIRE ASSEMBLY i HAD BRAKE LIGHTS, AFTER i TOOK YOUR RECOMMENDATION TOTEST IN THE BACK WITH A BULB AND GROUND THANX AGAIN FOR A EXCELLENT JOB.

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  • Toyota Master
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In that case the problem is at the rear lights wiring loom - the wiring is faulty. First check that power actually comes to the loom when you press the pedal. Next check that the power reaches the bulb itself - for these two tests a simple bulb wired directly to the car body will do. Finally check the grounding coming from the bulb.

Posted on Jul 28, 2010

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  • Master
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At the brake switch - do you have voltage coming IN to the switch.... and voltage going OUT when you press the switch?

Thanks!

Posted on Jul 28, 2010

  • william cook Jul 28, 2010

    I checked the dc voltage at the 4 prong plug going into the brake light switch and could only get 12 volts at on prongI will go back out and check for dc volts going out.

  • william cook Jul 28, 2010

    I m sorry I was checking the neutral switch but I removed the brake switch and Ihave 12 volts dc coming out of the plog with 4 prongs 2 sm and 2 larg when I hook up the brake switch and activate it the power comes and goes as I activate the switch.

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