Originally Posted by Oldmso54
OK -should have provided a little more info
* so no i'm not 100% sure where the pump is
* the pump switch in the coach is definitely not on
* didn't know there is a pump switch in the wet bay (will look for it)
* connector pin? voltmeter? - not really in my wheelhouse
* moved to NC last year to babysit grandson (updated profile)
* coach batteries are good
So I think the issue is that there was no water in the fresh water holding tank since I now the pump switch inside the coach is definitely off.
Thank you everyone - especially the honestly helpful posts!
You would have to know where pump is in order use a voltmeter on the connector pin that supplies power to the pump from the switch.
But let's shift gears since that is not in your wheel house.
You say "the water pump (pretty sure it's the pump?) started running." can you take picture of what you hear or where the sound come from? Not questioning you but what make you pretty sure it is the pump if you don't know where the pump is?
All we know for sure is that you have something running and when you turn off shore power it stops. Think of it this way, if water pump switch or pump itself was somehow defective and drawing current; would run 24/7 until your batteries drained dead.
My guess is that you may be hearing the converter running to charge batteries or something which would be perfectly normal as long as you have shore power. You unplug the shore power and it stops
FWIW you winterize like me using the air blow method