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The reason for this is because you have lost your ground or have a poor grounding connection. You will need to check the ground wire on your trailer wiring to ensure its solidly connected. Additionally – double check and make sure your trailer lights themselves are solidly grounded to the chasis of the trailer.
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Personally what I would do is run an independent ground wire from the chasis of the vehicle to the ground wire and chasis of the trailer itself to test what I have said here. If it cures your problem – then you just need to make the connection permanent.