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Re: hooking up trailer lights
Are you checking your lighting with the trailer hooked up? This is the trailer's ground source. The white wire on both sides of the plug is the ground wire. Grounds are very important, Make sure they good and clean.
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I would try hooking the trailer up to another vehicle and see if everything works right if everything works on the trailer I would start testing the trailer plug on your truck could be a wire has broken.
make sure to check the wiring on the trailer and to make sure that there is no damage or loose wireson the hook ups themselves. the wres could have come loose on your truck where they hook into the hook up for the trailer wiring. if any wire has come loose or the ground wire for the lights have come off, they will not work.
yes it sounds like the converter is no good,the converters purpose is, when you have a trailer it uses the brake and signal on the same bulb, so if you were to step on the brake and have the left signal on, then the left brake light would turn into the signal,on your truck it has sperate lights for signal and brake, the converter converts this into one light for the trailer, so just replace the converter and everything should work fine, hope this helps.
Have you tried a heavy duty flasher? Also, if your signals & brake lights are 2 different bulbs, as in amber for signals & red for stop, then you will need a small in line converter to separate those 2 as most vehicles use same bulb for signal & stop.
Is this a 4 way or 6 way connection system? If your truck is wrong, then all factory equipped trailer package harnesses would be wrong, tell your trailer guy...I don't think so.
Is this the first trailer you have hauled?
Let me know, and we will go from there.