Vic, I wasn't very clear. When I wrote that we were using accessories, I meant we push the Power button in the truck cab twice, without pressing the brake. This is like the olden days of yore when you turned the key two clicks, but didn't engage the starter motor. So the radio comes on, you can raise/lower windows, charge phone in cigarette lighter, etc. without running the engine. We were not using anything in the camper (but compressor fridge was on).
I'll write down the exact message next time and report back.
My belief is the isolator is not is isolating when we turn on the truck accessories as described. It's not checking for engine running. But I don't know this for sure and haven't tried any other diagnostics. Is the isolator supposed to be turned on when the engine is running and especially when the alternator is running?
