Got another trailer not to long ago and notice that the lights on it were not working. After checking the wiring near the connection ...I noticed that the ground wire was not attached to anything. It wasn't noticeable before because it was encase within a sleeve to protect the wiring. The lights work when I touch the wire to the trailer, but not everywhere. I don't remember how the other trailer was hooked up so I'm wondering where in fact does the ground wire attach to ground the circuit?