It can vary, year to year but on my 99 , flipping the switch disconnects the batteries from the charger too.
Easy enough to check out , with your unit plugged in , flip the switch and check voltage at the batteries,with a multi meter, if it's not over 13.2v , the batteries are not being charged.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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