I can't remember if I posted about this here or not, but I've been having a charging issue with the truck for a few months now. I'm on my 3rd alternator, and 2nd Optima battery. Both the battery and alternator ccurrently in the truck test out ok.
The system only seems to lose charge when the battery is connected, but the engine isn't running.
It's not the electrical cooling fan. The problem is present even when the fan wiring is totally disconnected.
It's not the alternator. I've had the same issue now with 3 different alternators, and the current one seems to be charging properly while the engine runs.
It's not the battery. The battery holds charge fine, but seems to have some type of draw when the engine isn't running, and is what eventually causes the truck to stop running.
So, now we begin the long, monotonous process of trying to track down a draw on the charging system fuse by fuse. If that doesn't turn anything up, then it may be a PCM issue. Anybody have any insight/suggestions0things I might not have considered?