I have a 93 1500 that I added a trailer add on isolated trailer wire harness. I converted it from a 5 wire to a 4 wire with a hopkins taillight converter. I used the wiring identification from both to match up wiring funtions. I hooked it up to a trailer I have and the turn signals do not work. Can anyone tell me why the turn signals don't work? I checked the plug using a dc tester and showed no power output on the two turn signal connections.