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What is making one of my trailor tail lights stay on even when car is off

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Check the earth wire on the car is making a good connection to the Car body. check the trailer socket on the car has a good ground to the car body.
I have had this happen on a trailer and this was the cause as the circuit makes a path through the tail light.
if this is not the cause you may have a short circuit with a live voltage wire in the car and will have to check the wiring .
A 12 volt probe would help trace this and also to check the wiring is correct. Google trailer pin out
to work out if wiring is correct.

Posted on Dec 14, 2016


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