Question about 2000 Jeep Grand Cherokee

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When the brake pedal is depressed with the headlights on the taillights and brake lights go off, have already checked brake light switch and made sure that I have good grounds at rear tail light assemblies and have good continuity so I no that grounds are good and brake light switch is good any help out there?

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  • Jeep Master
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Brake light relay may be weak. You could check the socket to see if the signal is there and yet the relay is not holding.

Please see my tip at http://www.fixya.com/cars/r6053280-lights_out_lights_not_out_bulbs_ok . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.

Posted on Oct 05, 2010

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  • Jeep Master
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Not sure I believe you have good tail light grounds.
But to be sure, just check for power at the taillights, with the brake on.
Make sure you use your own guaranteed chassis ground.
If the power really does go away, then it is an odd problem.
First thing I would suspect is if anyone has wired a trailer harness incorrectly.
About the only other thing I could think of is that they may be on the same fuse, and a semi-short in the brake light circuit could be drawing down too much of the current. But unlikely.

Posted on Oct 05, 2010

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