Brake lights out

[GloNDark]

It's happened twice now, took about 4000 miles to happen originally. Then another 1000 miles and it's blown out again.

20 amp fuse, only non stock item is the brake controller. And it doesn't happen with the trailer is plug in. So I'm guessing it's not the trailer. The dealer checked the brake light switch which seems to be working properly.

Any ideas? Tonight I'm going to check the ground wires on the tail lights, 3rd brake light and the trailer brake controller.

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2006 SLT Big Horn, Auto trans, 4.10 gears, Leveling kit, Ultra 17x9's, Straight pipe, Amsoil air filter and torque tube, Isapro gauges, Smarty JR, custom Stereo and a bunch of other crap.

[BSouth]

Was the brake controller installed the 1st time it did it?

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05 3500 Yellow 6 speed, Mega cab dually fenders, Rumble Bee Scoop, Edge Juice w/ A2, Striker 2, Valair 3600 DD, 5" Silverline exhaust, Icebox with torque tube, Rokkteck, Quad Rail Gauge, Mag-Hytecs, Brite Box w/ Fogzilla

[GloNDark]

Originally Posted by 99cummins

Was the brake controller installed the 1st time it did it?

Yes , the brake controller was installed the first time it did it. I could unplug it and test it out, but like I said it took over 1k miles to blow again. And I pull the trailer on a pretty regular basis.

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2006 SLT Big Horn, Auto trans, 4.10 gears, Leveling kit, Ultra 17x9's, Straight pipe, Amsoil air filter and torque tube, Isapro gauges, Smarty JR, custom Stereo and a bunch of other crap.

[jimbocableguy57]

Had the same problem in 2004. After going through several fuses, I found the problem to be the bulb socket contacts. Dealer had to replace the assy., and said this was common. I thought they had done a fix on this problem, but you might check anyway.

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2003, SB Quad 2WD, 2500HD, Cummins HO 6 speed. Truck of my dreams!