teleflex says those marks are from electrolysis. I think they are from a bad plating job. They used to come with a mirror finsih, but a few years back, they started showing up with a satin finish, shorty after, I started replacing a lot of seals on them, the new rams have a more polished finish.
On that trailer rewire, go to wally world, buy a 16 ga. 50 ft extension cord, run it down each side os the trailer, now you have three insulated wires inside its own cover, you use one wire for turn and brake, and one for running lights, take the last wire and use it as a dedicated ground(hook it to the white wire on your harness). Poor grounds are 90% of trailer light problems(other than a mechanioc taking them ot with their shin)
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