I have a tail light problem that makes no sense. I hope I can explain it so it understandable. I have led tail lights from super bright. When tested with a battery at the connector everything is OK. When hooked to my 93 GMC jimmy everything is OK. When hooked to my 98 chevy venture the tail lights work OK, the turn lights work OK, the stop lights work OK, untill I have the lights on, then the turn lights don't flash, untill I step on the brake, then all is OK. The converter box on the venture was just replaced, grounded on the same lug as the other grounds for the van. The trailer lights are not grounded to the frame, all are on a dedicated ground wire. The connector on the van tests just fine with a plug in tester and with a test light. I hope this makes some sense to someone because it dosn't to me. I know in my mind that it can't work this way but it dose.
Thanks in advance to anyone who can explain why this is happening.
Brwbier