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Discussion Starter #1
I have a 25 foot dual axle trailer with LED lights that work until I turn the park lights or headlights on and then nothing works. I have not found a problem with the wiring on the trailer yet , could it be the four way plug at the truck.
thanks for your help
 

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The logical answer is the two plugs are not wired the same. Usually the the middle two are reversed. The outsides are usually pos and neg. Square side of plug (I believe is +). Try jumpering and see if it works.
 

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A voltmeter on the vehicle plug will tell you. Make sure you have a good ground wired directly to lights not through the trailer frame.
 

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Ground
 
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squirt some wd40 or something equivalent, into the truck and trailer plugs. maybe some corrosion in it preventing a good connection.
 
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