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Headlights Tail and Brake Lights
Mercury Grand Marquis
Jeep Grand Cherokee Limited

What could be wrong with your car if the brake lights work when the lights are off but when the lights are turned on the passenger side tail lights and brake lights completely go out?


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Wiki User
2005-02-03 17:51:11
2005-02-03 17:51:11

This is usually a grounding problem. Either an insufficient ground to the assy or a positive to ground problem. As you mention the brake lights work with the lights off, it will probably be related to a problem with the "running lights" system. As you mention only a problem with the passenger rear, I would check for a poor ground related to that light assy or possibly one of the bulbs' internal filaments in that assy touching each other. Or possibly a socket failure at that assy. Good Luck

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Brake lights should NOT be effected by the headlights. Brake light function is completely independent of the headlights. Assuming you are not refering to the tail lights, or marker lights, which are supposed to come when the head lights are turned on. Not having brake lights when the head lights are on is a big safety problem and should be corrected.

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Assuming you have the lights turned off, you are seeing the brake lights. They are more than likely on because the brake light switch is defective or out of adjustment.

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On a toyota tacoma 2003 SR5 when the tail lights are turned on the brake lights come on and when the tail lights are of the brake lights work just fine what could be the problem. If the truck has a trailer plug, inspect the plug and plug wiring for damage and corrosion.


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