Run a ground wire all the way to the lights
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Run a ground wire all the way to the lights
My trailer light wouldn't work so I went and bought a new set.
Long story short the plug on my Van was bad, inside the plug the connection that is male had broken off. So I stuck a nail in to replace the post and its worked ever since. Took the lights back luckily I hadn't opened them.
Had a lab puppy years ago that was very good at unwiring trailer lights
Both connecters on 4w plug have a white wire one goes to truck frame .....The other white wire should be connected to trailer frame (ground each light to frame next to light using frame as ground wire) the latter usually has connection problems due to getting water bath at every launch and recovery..
Or from that single white wire coming from trailer plug ,junction all grounds wire from each trailer light there on tongue (it won't take a bath at each launch and recovery)... try to stay with White wire(for Ground ) sure helps keep it all straight ....Most of my troubles have come from salt water it accelerates corrosion...esp when you put, steel frame /copper wire/ and salt water together...I had my best luck with this method..
Hope this is clearer than MUD
That way prevents a lot of problems