Troubleshooting Brake Controller that Says It's Not Connected to Trailer

Question

Question:

All of the lights on my trailer work but not the trailer breaks I get a messages saying the brakes are disconnected and check trailer brakes wiring

asked by: Robert M

0

Expert Reply:

This is a fairly common problem that is almost always due to corrosion on the trailer connectors. Check both the connector on the tow vehicle and on the trailer for corrosion and/or a bent pin and fix as needed.

I attached a help article on troubleshooting brake controllers for you to check out as well.

expert reply by: Jameson C

0

Answer 1

The difference between an load range C and load range D tire in the same size is the capacity and psi rating. The two tires will still have the same dimensions and fit on the same wheel. The D rated tire has a higher capacity. For a ST175/80D13 like…

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Answer 2

The Loadstar ST175/80D13 trailer tire, #AM1ST76, is a good tire for a pop up camper. But if you will be towing the trailer often or over long distances, a radial tire, #AM10199, would be a better choice. Radial tires track better and offers more…

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Answer 3

Light truck tires (LT) are sometimes used in RV applications but generally not on utility trailers. Light truck tires are a type of passenger vehicle tire and as such they are not built with as thick of a sidewall as trailer tires. A thicker sidewall…

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Answer 4

The flicker you are seeing on the brake output circuit of your vehicle is normal. Brake controllers will lightly pulse their output circuit to check to see if a trailer is connected due to the amperage draw of the brake magnets. So what this all…

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Answer 5

The easiest way to tell if the brakes are working on the trailer would be engage the manual override and have a friend sit outside the vehicle and watch the wheels on the trailer. If they begin to drag when you let off the brake pedal (slowly) on the…

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Answer 6

The Draw-Tite Ultra Frame Trailer Hitch Receiver #DT35MR is currently our only class IV receiver that fits your 2020 Ford F-150 XLT that did not come with the factory receiver. The Curt T-Connector Vehicle Wiring Harness with 7-Way Trailer Connector…

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Answer 7

There is definitely a short somewhere and since you disconnected the 12 volt power wire from the newly installed 7-Way the only items left that could cause this is the brake controller and its wiring. But make double sure that the white ground wire…

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Answer 8

I would be happy to help. Since you replaced the Trailer Tow Parks Lamps Fuse 53 in your 2019 Ford F-150 and are now not getting any power to your 7-way connector, I recommend checking fuse 43 as it is for the trailer tow park lamps module. If that…

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Answer 9

Aftermarket brake controllers send a small amount of voltage along the brake output wire, if a trailer is connected, the magnets in the brake assemblies will create a power draw. This power draw tells the controller that a trailer is connected. The…

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Answer 10

All the brake controller needs to sense a trailer connection so that you can test it is a slight amperage draw on the output circuit. For that you can use a circuit tester like the part #PTW2993 with one pin grounded and the other on the output pin.…

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Answer 11

The "Trailer Disconnected" error message on the dash with a factory brake controller is usually related to an issue with the blue brake output wire that runs from the brake controller to the 7-Way connector. The fact that the issue remains…

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Answer 12

If you are getting the error message "Trailer Not Connected" when using the Prodigy P3 #90195 trailer brake controller there are several potential causes. You should only need to have the trailer plugged in to avoid seeing this message; it…

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Troubleshooting Brake Controller that Says It's Not Connected to Trailer

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