Trailer Brake Fuse - Chevy and GMC Duramax Diesel Forum

 
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post #1 of 6 (permalink) Old 05-29-2012, 04:58 PM Thread Starter
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Trailer Brake Fuse

I'm having an issue with my P2 brake controller not stating it's connected. all lights work as should. It has worked before. I'm thinking maybe a fuse but can't find it in the owners manual. I've gotta belive there is a fuse for the trailer brakes, anyone have an idea where it is?

Thanks

2006 LBZ RCLB
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post #2 of 6 (permalink) Old 05-29-2012, 05:22 PM
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Should be clearly marked under the cover for the fuse box under the hood.

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post #3 of 6 (permalink) Old 05-29-2012, 05:30 PM
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These newer truck have issues like this a lot more than the older models. I've had a ron of problems like this with my 2009 3500! Once it was the brake controller that came with the truck, another was the wiring in the rear just before the 7 way, another wire was rubbing in the glob of wire near the fuse box under the hood, another was the wires coming out of the controller rubbing against the firewall,

What I'm saying is start with the fuse ( if you have NO brakes), then start behind the brake controller and just check the wires all the way to the rear, should be a blue wire all the way down the line.

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post #4 of 6 (permalink) Old 05-29-2012, 05:44 PM
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He has a 06, and those do not have the integrated brake control system.

The fuse is in the under hood fuse box. You should take the trailer plug apart and check the wires.. might have a shorted/loose wire there. Another place-- check on top of the fuel tank-- the 5th wheel wiring harness is there and can get bare wires. It is a long harness without a end, just taped off wires.

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post #5 of 6 (permalink) Old 05-29-2012, 05:56 PM
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Quote:
Originally Posted by Gooch View Post
....I've gotta belive there is a fuse for the trailer brakes, anyone have an idea where it is?

Thanks
Several.
Out in the Underhood Fuse Block, the ‘STUD#2’ fuse feeds the brake controller. If you have display lights on the controller, you have power to the unit.
2nd, the activation of the controller comes from the ‘VEH CHMSL’ fuse which you’ll find on the left side of the dash in the Instrument Panel fuse block.

If those are good, you’ve got a connection problem. Does the controller show any error codes? Start with the harness at the rear of the controller and make sure it’s seated properly, they get loose. If that’s good, move to the rear trailer plug and troubleshoot there, followed by the trailer’s wiring.

Have you tried to plug in to another trailer yet?

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post #6 of 6 (permalink) Old 05-29-2012, 06:37 PM Thread Starter
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Quote:
Originally Posted by Hook'em_Horns! View Post
Several.
Out in the Underhood Fuse Block, the ‘STUD#2’ fuse feeds the brake controller. If you have display lights on the controller, you have power to the unit.
2nd, the activation of the controller comes from the ‘VEH CHMSL’ fuse which you’ll find on the left side of the dash in the Instrument Panel fuse block.

If those are good, you’ve got a connection problem. Does the controller show any error codes? Start with the harness at the rear of the controller and make sure it’s seated properly, they get loose. If that’s good, move to the rear trailer plug and troubleshoot there, followed by the trailer’s wiring.

Have you tried to plug in to another trailer yet?
Ding Ding Ding!!!

pulled the VEH CHMSL, fuse was good, put it back in and the controller connected. never would have thought to pull the VEH CHMSL fuse.

2006 LBZ RCLB
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