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Troubleshooting a Draw-Tite Brake Controller # 5100


i do not have a green light and controller does not seem to work when on trailer. i replaced unit with a used one but same thing. have power to unit. also there is power going to brake switch


Expert Reply:

You will want to confirm that you have the wires of the controller attached in the correct manner.

The blue wire is the brake output circuit and will be run to the 7-way.
The black wire is the 12 volt circuit wire that will be run through a 30 amp circuit breaker to the vehicle battery.
The white wire is the ground wire and will be attached to the negative side of battery.
The red wire will be run to the brake switch signal that only sees voltage when the brakes are applied.

If that does not fix the problem I would try the following procedures.

If you have not already, I would try hooking up to a different trailer that you know works and see if the problem persists. If you are still experiencing this problem you know the problem is not in the trailer. If the problem goes away then you know the problem is in the trailer, and you will want to check for loose wiring and corrosion on the trailer wiring and fix as necessary.

On your vehicle the first thing I would check is the brake output circuit on the Draw-Tite Brake Controller # 5100 for voltage when the manual override lever is pulled. I would use a Circuit Tester # 3808 for this, you will also want to cut this wire to prevent back feed. If there is voltage here then you have ruled out the controller as the problem.

Next, I would start at the rear of the vehicle with a # 3808 and have a friend activate the manual override of the Draw-Tite Brake Controller, part # 5100, and check for voltage on the brake output circuit. If there is not voltage there you will want to check the back of the connector and look for loose wiring or corrosion and fix as necessary.

I attached installation instructions for the # 5100 for you to check out that also has a troubleshooting chart for you to check out, as well as an FAQ article on trailer wiring.

expert reply by:
Jameson C

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