[Lakegeezer]

My Honda gave me hours of debugging joy where the trailer running lights worked but not the turns. The 7-4 wire adapter has lights showing what is working, so I knew the problem was in the car. Solution was a fuse, but it was in the back of the vehicle, behind a panel on the left side. However, as an owner of four trailers, the ground is usually the problem, followed by corroded bulb holders.