ok guys I just noticed this last night, after work around 7 PM turn the car on and walk back to my office but I noticed that the HDM lights were off, check the switch and was in the automatic position, turn the switch to my right and lights turn on, set it again in the automatic position and...

I have an '02 envoy. We do alot of towing whether it be boat, snowmobile trailer, open trailer, etc. Recently (this year?) we noticed that we have no running lights on any of our trailers when hooked up to the Envoy. Hook up to our pick up and all is well. I have looked through the manual and...