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Technical Info: 3rd Generation: NON-DRIVETRAIN Technical discussion of third generation (2003 - 2007) non drivetrain questions, solutions and upgrades. Please -- DO NOT post drivetrain discussions in this forum!
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Old 06-27-2011
jess rupert jess rupert is offline
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Default No Brake lights on bed - cab Ok

No Brake lights - help

06 3500 with Flat bed --All worked fine UNTIL - hooked up and pulled a trailer now and brake lights don't work on bed - trailer lights OK. Turn signal lights OK and tailights OK - just no brake lights.

Checked the following:
Fuse OK - Cab Brake light OK -
Wires from cab floor board back on driverside check out OK.

I think they use left and right side wires. (Didn't check right side)

Looks like a factory harness and it has a trailer brake control unit in the cab.
Looking for advise.
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Old 06-27-2011
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Biggest problem those trucks have is the TIPM module , the trailers increased wire size and bulb requirements throws it into a limp mode and can only be reset by the dealer.

When you get it reset, remove all your lights on the trailer and replace them with LED lights . This will reduce the load requirement.

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Old 06-29-2011
jess rupert jess rupert is offline
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Thanks for good info on brake lights - Will do!
Jesse R
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brake lights, harness, tow, trailer, wiring

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