Hay Geofkaye, I sent that same text to United tech support e-mail. Guy named Ed. He replied pretty quickly. Turns out that other red wire runs up to the dash mounted house 12v shut off switch. So, if that switch is "off" it isn't connecting the charger/inverter to the battery system (either the deep or the truck batteries depending on the position of the rotary switch). So, when plugged in to shore power I need to make sure that switch is turned on and it will charge the batteries. Or, he said I could run a 8 guage wire from the charger to the rotary switch. He said that's how they do it now, they don't run that wire to the 12v shut down switch. Oh well.
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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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