Troubleshooting trailer brake lights not working when running lights are on question i put all new trailer lights and wireing on my boat trailer lights work turns work i am pluging into an adapter 7 pole to 4 pole and 5 pole when i have the lights on and put on the brake the lights go out. It is possible that one of the bulbs on your trailer burned out so check the lights if the bulbs are not the problem disconnect the trailers wiring system from the tow vehicle test all of the lights from the backup lights to the turn signals and brake lights to ensure the problem is not the tow vehicle itself. Electric trailer brakes are a very well engineered products with few moving parts and no fluid to leak they are as close to trouble free as any brake could be expected to be for this reason when there is an issue with electric brakes it is usually quite quick to diagnose however most problems with these brakes . How do i troubleshoot trailer wiring problems response by bass rogue dated 11 26 1998 for example the running lights come on when the brakes lights come on a typical tow vehicle jack is an in line four pin jack it has three female pins and one male pin the female pins carry the voltages for the different lights the male pin is the . Step by step guide to fix trailer lights testing both the vehicle and the trailer with a variety of test equipment so test that connection first when troubleshooting a problem electric brakes if your trailer is equipped with electric brakes you will need a floor jack that enables you to jack up one wheel at a time
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