Troubleshooting OL Error Message on Hidden Hitch Brake Controller # 80550 on 2007 Chevrolet 4WD 3500  

Question:

Expert Reply:

An OL error message on your brake controller indicates an overload error which could be caused by a bad ground or a short in the blue brake output wire. It sounds like the position of the wiring could be changed when the trailer is jacked up. Due to this, a nicked or loose wire may be touching the frame or some other metal component when the trailer is not jacked up so be sure to check the wires to ensure there are no broken or nicked spots.

If the issue still exists, you will want to check the connector at the back of your 2007 Chevrolet Silverado 3500 4WD to ensure the connection is free of dirt, moisture, or corrosion. This would cause a bad ground or short to the brake output pin. If this is the case, you will want to clean the connector and it is a good idea to clean out the connector on the trailer side.

You may also have a bad ground from the brake controllers white ground wire to the ground point. Check for corrosion and, if it exists, clean it out and re-attach the ground. Check all these factors on the trailer side as well.

Another potential issue could be the electric brake magnets on the trailer. They may be worn out or not working properly. You can check the magnets and if you see any of the windings, they are worn out and will need to be replaced. To test the magnets, use a mulitmeter such as the Buffalo Tools Multimeter # PT89ZR. I am also including a link to an FAQ article on testing trailer brake magnets.

I have also included a link to the installation instructions to the brake controller.

expert reply by: Brandon M

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