Quote:
Originally Posted by yukongrant
It's my understanding that the switch should be in the "On" (Use) position for any charging including from the alternator. (I reread the documents and it's not completely clear - but seems to indicate it.)
Our rig is parked in our yard - so if we're not travelling, it's plugged into shore power. I very seldom turn that Use/Store switch off. It charges from the AC when parked and charges great while driving from the alternator.
If your batteries are charging with the switch in the off position, something does not seem right. It also does not seem right that your fridge is running on 12V with that switch in the off position.
Maybe do a few more "tests" with a volt meter? Engine running, switch off; Engine running, switch on; Engine off, switch off; Engine off, switch on; Shore power (or generator) on, switch on and then off.
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According to the TMC Electrical system guide
Chassis Alternator
The motorhome’s electrical system is wired so that when the vehicle's engine is running, and the chassis alternator is engaged, charging voltage is supplied to both the chassis and house battery(ies). The house main battery switch must be ON in order for the house battery to be charged by the chassis alternator (see Chassis Alternator and Battery Isolation Manager Sections).!
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