 08 Trailer wiring ?
Got an aftermarket hitch installed by uhaul, and it came wired with a 4-flat harness. The trailer that I commonly use (no brakes, just lights) is a 7-pin round, so I also bought a 4-flat to 7-round adapter. Everything worked great except the blinkers were going at a very high speed. Then it got dark, and with the headlights on and the brakes on, no blinkers worked - both sides just flashed like the emer. flashers were on. I went back to Uhaul and they tested their wiring and all is well (for the 4-flat). The problem stemmed from the adapter not being grounded separately. So I grounded it to the frame and now all the lights work, regardless of brake or headlights...but they still blink at a higher speed when the trailer is on. It drives me nuts! Anyone have any ideas? Is there a relay that needs to be in there, or is my wiring still not really correct? | 
