Trailer Wiring

[dpage70]

check your grounds first. where i work we do a lot wiring on trucks and 90% of the time when things just dont make sense it's a bad ground somewhere.

[Cobra190]

I'm in aggreement that the heavy duty flasher will fix the fast turn signal problem. Have had to do this myself in the past. As for the turn signal lighting problem, either you have bad bulbs or your not wired into the turn signal from your vehicle. Wiring from truck tail lights to plug may have both wires tied into the brake wire and not the turn signal.
Good luck in figuring this one out!!