12V Electrical puzzler (trailer lights)
Have a very strange issue with the lights on my tow dolly. The issue is with the coach, not the dolly as it manifests itself at the trailer plug in connector. Turn signals work normally. 4-way fla...
Forum Discussion
DrewE wrote:
Do you have separate turn and brake bulbs/filaments on the coach itself? If so, possibly even if not, there is some circuit or box that combines the brake and turn signals for the trailer. That would seem to be the point of failure.
I suppose it may also be a bad ground somewhere, though I can't really think of precisely how that would actually work out. Still, many mysterious truck and trailer wiring problems end up being bad grounds.
X2 It's always the ground.
