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Old 08-02-2012, 10:40 PM   #1
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House appliances run whether breaker is on or off. Normal??

Our inherited 1991 Sportsmobile failed to start this morning -- no response to ignition at all. Wondered if we had accidentally drained van battery by somehow leaving something on in the "house." Checked refrigerator, water pump, heater, lights -- all are off. (No microwave or water heater in this SMB.) Checked breakers: all 4 are off. Just to see what would happen, turned refrigerator on... it started up! Tried water pump: it runs! Lights work, too. Breaker is still off. Hmmmm, how can this be? I thought the breaker turned everything off. Turned breaker on, then tested all electrical items... same results as with breaker off (refrigerator runs; water pump runs; lights work). So... breaker has no effect on house appliances/electrical. Is this normal?
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Old 08-03-2012, 12:19 AM   #2
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Re: House appliances run whether breaker is on or off. Norma

Yes normal, 12v and 110v systems are separate. The breakers are 110v only, so everything you listed ran off of 12v. Sounds like you've got good house power, and the isolator should keep your starter batteries from draining (if say you leave the fridge on) so it's doubtful it was something on the house side.

Check your van radio switch, that can kill both and otherwise something in the cab or just plain bad starter batteries.
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Old 08-09-2012, 11:47 AM   #3
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Re: House appliances run whether breaker is on or off. Norma

Thank you Jage! Great information.
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