99% odds it's a grounding problem. :thumbup:
Reality check - I'm used to house electrical so 12V DC is a strange new world. There are only two wires that run to each light. One is 'hot', right? The other is the 'ground/neutral'? If I run another 'white neutral' do I use it in lieu of the ground/neutral? In addition?
The wires running into the lights are both the same colored wire.
The ground connection is the lamp housing. I'd put a ring terminal on your new ground wire and put the terminal between the head of the bolt and the housing.Each side light has two wires going to it. White wire seems to terminate at the ball. If I want to run a separate neutral/ground what would I hook it up to at the light end. Each light has two terminals - where would I attach the white?