Question about 1999 Jeep Grand Cherokee

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My driver side rear taillight light does not work when the head lights are on but works when the brakes are depressed. I have already cleaned the contact points and replaced the bulb with no luck. Thanks.

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Check,by that i mean loosen remove clean/scrape ,the ground wire going to that tail light assembly . you should find it on the frame near wire harness plugs.

Posted on Nov 12, 2009


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If the upper center works then the switch at the brake pedal is working properly. Maybe only two of the taillights are equipped with dual filament bulbs. If this is the case ( and it usually is) then you have two burnt out brake bulbs. They are dual filament and only one is lit (the lower intensity one) when the lights are on. Then the higher intensity filament lights when you hit the brakes. Open your trunk and take one out and look at it. Sometimes you can see the filament just hanging in there unconnected to one of the two posts. That means it is burnt out.

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Check your fuses underneath the drivers side steering wheel. Flip the plastic cover over and there will be a diagram showing the fuse that controls the taillights/stoplamp. Pull the fuse out and replace it with the same number fuse and your taillights and brake lights will work again. If the fuses are ok, pull each taillight bulb out and replace it with a new bulb. Sometimes when one light bulb fails, all of them will fail.

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Yes , The wiring in question does effect the brake lights because they all run on the same circuit.
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Fuse, should be labled taillights in the fusebox under the driverside dash..

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