I would start determining if the problem is on the trailer or the tow vehicle side of the wiring. You will need to use a circuit tester like our part # PTW2993 to test the functions of the trailer wiring harness on your tow vehicle. A video is included to show how this is done. While your testing the running light pin on your tow vehicle make sure the connector is clean and free of corrosion. Do the same for the trailer's connector.
If the problem is on the tow vehicle then most likely... view full answer...
According to the instructions for the Curt Spectrum Trailer Brake Controller # C51170 there are 2 reasons why the lights should be flashing.
The first is if it's flashing red and yellow which means the brake controller is overloaded or there is a short-circuit somewhere on the brake controller line. To remedy this you'll need to check your wiring and connections and fix the short.
The second is if it's flashing blue and this indicates that the trailer has been disconnected or if the brakes... view full answer...
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