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Old 04-06-2014, 11:55 AM
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Warlock III Warlock III is offline
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Dustin. The tail lights should be on the same circuit as the dash lights. This is usually done to inform you that the tail lights aren't working. If the dash lights go out then the tail lights and vice verse.

However, you indicate that the brake lights are staying on...

The dash "fizzle" could be the result of a short in the wiring to the tail lights. If the wires going to the rear of the truck have become pinched together and chaffed then there's going to be cross contamination. It stinks, but I believe that you're going to have to trace the wiring above/behind the fuel tank all the way back to the plug-in connector to the tail lights.

I would personally remove the bed. You're located in Texas so I'm a little apprehensive about rust. But It may be a contributing factor.

I'm not entirely sure that it's a brake light issue and may be a short from either the running lights or a ground (positive ground). Since you have removed the fuse that SHOULD rule out cross-contamination in the circuit regarding the dash/tail lights.

I'd start by checking the fuses. Make sure they have the proper size fuse and test the fuses individually. Even though they can look good to the naked eye they still may be bad. There's also a plug about 16-20 inches down from each tail light that could be corroded.

Have you been mudding, submerged, etc?

I'd pull the tail lights and check the sockets to be sure one isn't melted or bad.

I'd check the trailer connector at the back of the truck to be sure that it hasn't become pinched and causing a short in the wiring going to the main harness.

Then if all else failed, I'd remove the bed and inspect the rest of the wiring thoroughly. Especially where it passes behind the tank. If there's some rocks/gravel up there they could have worked their way into the wiring harness and caused a short.

Another alternative is to locate a good harness at a recycler and re-route it to the back of the truck if necessary from just under the cab of the truck.

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Last edited by Warlock III; 04-06-2014 at 11:58 AM.
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