Also, shouldn't the voltage at the truck batteries be 13.4v when the switch is set to that position and the charger is powered from shore power? Something is goofy here. I don't have any problem running a 8 guage wire from the charger directly to the main switch terminal if that's going to solve my problem. The main reason I am trying to figure all this out is that right after buying my rig I had to replace all 5 batteries. They were all crap. The truck had been sitting on the dealers lot for almost a year and a half. So, I just figured they hadn't kept the batteries fully charged and let them freeze over the winter and killed them. But, I also now notice when I've got the fantastic fan running in the bathroom and I flush the toilet the fan slows down noticably, like it's losing amps/volts. Then after the head is done flushing it speeds back up. That's when I started checking everything with my voltage meter and found this.
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'03 Freightliner FL112, 295" wheel base, with '03 United Specialties 26' living quarters, single screw, Cat C12 430 h/p 1650 torque, Eaton 10speed , 3.42 rear axle ratio
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