My 2001 30 foot Fleetwood Storm has recently stopped charging the 12V batteries when connected to Shore Power. The 12v batteries are fine and when I test the power coming out of the power converter I get >10 DC volts output. I have tested the relay/transfer switch and this is what happensIf connected to Shoreline I get >10 DC Volts at all three connections (the Generator line, Shore line, and Circuit Breaker.If Generator running and Shore line cord plugged in I get the same at all three connectionsIf Generator is running but not plugged in I get only >10 DC Volts at the Generator connection not the other two.Does any of this make sense as to why my 12V batteries are not charging when I am plugged to shore power?Please help

What are the actual voltages you're seeing? You should have somewhat over 13V from the converter--around 13.5V if it's a single stage converter, something between 13.2 and 14.x volts if it's a multistage converter depending which stage it's in. If you're only seeing 10 or 11 or 12 volts, it's not operating properly and you're just seeing the battery voltage. It may be broken, or it may just be that the reverse polarity fuses are blown.

Try to verify with other sources if needed, but I believe that voltage should be 13+ as a minimum. Suggest you check breakers, fuses , and fittings in that order for a problem.

Check under the camper at the breaker that runs from the battery then through that breaker to the inside of the unit. There is a small button reset on them to reset them. I had this happen and that is what it ended up being. This will let the unit run off of shore power but not off of 12v.

My multimeter reading settings jumps from 10v to 250v so it is hard to read exact measurements. I changed out the transfer switch today and I want to test whether it is now charging. About how long should it take for the 12 v batteries to down if I leave the lights on in the coach?

12V battery not charging when attached to shore power

mmoore43
Explorer
Jun 29, 2017
My multimeter reading settings jumps from 10v to 250v so it is hard to read exact measurements. I changed out the transfer switch today and I want to test whether it is now charging. About how long should it take for the 12 v batteries to down if I leave the lights on in the coach?
Lwiddis
Explorer II
Jun 29, 2017
Are you sure 10 volts?
ulvik
Explorer
Jun 29, 2017
Check under the camper at the breaker that runs from the battery then through that breaker to the inside of the unit. There is a small button reset on them to reset them. I had this happen and that is what it ended up being. This will let the unit run off of shore power but not off of 12v.
kerrlakeRoo
Explorer
Jun 29, 2017
Try to verify with other sources if needed, but I believe that voltage should be 13+ as a minimum. Suggest you check breakers, fuses , and fittings in that order for a problem.
DrewE
Explorer II
Jun 29, 2017
What are the actual voltages you're seeing? You should have somewhat over 13V from the converter--around 13.5V if it's a single stage converter, something between 13.2 and 14.x volts if it's a multistage converter depending which stage it's in. If you're only seeing 10 or 11 or 12 volts, it's not operating properly and you're just seeing the battery voltage. It may be broken, or it may just be that the reverse polarity fuses are blown.

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12V battery not charging when attached to shore power

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