xj brake fuse problems - JeepForum.com
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post #1 of 4 Old 03-12-2011, 03:55 PM Thread Starter
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really odd light problem

i have a 1998 jeep xj. every time i hit the brakes my brake light fuse blows and there is a grinding sound coming from the rear hatch lock. but if i just hit the unlock button for the doors the brake lights go on and stay on as long as i hold the switch. is there a crossed wire? bad lock switch in the back? please help

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post #2 of 4 Old 03-12-2011, 05:07 PM
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You have a short circuit somewhere. The blown fuses and the sounds from the hatch are your proof. You will have to use a volts/ohms multimeter to check the wires or physically inspect the wires for chafed/burnt insulation, pinched/cut wires, or any other faults that would cause a short circuit.

If you have a trailer light adapter, removing that would be my first step.


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post #3 of 4 Old 03-12-2011, 05:56 PM Thread Starter
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not the trailer adaptor. any other spots you can think of would really help. im really lost when it comes to chasing wires.
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post #4 of 4 Old 03-12-2011, 11:58 PM
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Most likely an internal "shorted to ground" dual filament brake lamp bulb. it would be the upper rear bulb in the back housing of our xj's.

The brake light/brake pedal switch/dash lamps are all on same circuit.

When you step on the brake pedal, a failed rear light that has the dual filament has a wire inside burned out and touching ground in the socket holding the bulb.

The current bypasses the bulb completely (or sometimes causes it to glow really bright) and is blowing your fuse since the fuse is suddenly seeing a huge rush of current.

Simply take a 10mm socket and remove the tail lamp housings and change BOTH left and right rear dual filament brake/stop bulbs.

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