2004 Jeep Grand Cherokee Logo
Posted on Jul 27, 2009
Answered by a Fixya Expert

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Driver side brake light works when headlights are off, doesn't work when headlights are on.

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  • Master 314 Answers
  • Posted on Jul 27, 2009
Anonymous
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Joined: Jun 09, 2009
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There is a short in the wiring. You will have to take a multimeter and see where the voltage is coming from and then go ahead and fix the problem.

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The brake light on the driver side is not working when the headlight are off, when the headlight are on the are fine.

Replace the brake bulb for that side. The brake bulbs have two filaments. Don't put the single ones. One is for when you press the brakes and the other is for when you run the lights at night it stays on all the time.
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HI Matt,
Your issue sounds like a fault, most likely in the rear lights. Current is feeding from the brake light circuit, into the running light circuit. The most common causes are a bulb filament broken and touching the running light circuit, and loss of ground.
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Brake lights out.

CHANGE BULB ON LEFT SIDE WITH PROPER BULB
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