Yesterday I was towing with my 95 Z71 and when I stopped at a light, I looked at the battery gauge. The needle was going back and forth in time with the turn signal. It was only a couple of marks back and forth, but I have never seen this before. What would cause this? I just had the alternator tested and it was okay; the battery is pretty new. Could the alternator be okay for regular use but not strong enough when the trailer is plugged in? It is the original alternator. Thanks!
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Thank you for your help! I just had to have the truck's wiring repaired and a new plug put in for the trailer. He wasn't sure exactly what I needed since the trailer wasn't there. He asked me some questions about the ground wire, but I had no clue. Guess I will run it back up there this weekend!