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Old 06-03-2014, 09:34 AM   #11
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Originally Posted by KyDan View Post
Explain how the defective gas valve works fine on shore power and not
on battery power??

I'm with most of the crowd here- You need to measure the
voltage AT the furnace when on shore power and then again on battery
power.
The only thing I can imagine making it act like this is low voltage when on
battery power.
My money is on a corroded terminal at the current limiter near the umbilical service box. A poor connection here will result in reduced voltage to the camper when operating on battery (even when the batteries check good at the battery.

OR

A bad or corroded ground connection at the frame. Follow the black/white wire from the battery to the frame.
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Old 06-03-2014, 10:53 AM   #12
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Originally Posted by alparmer View Post
A fully charged battery is ~12.6v. If you are reading more than that then the batteries are being charged. Being that the furnace works on shore power but not on batteries means you don't have a gas problem. It sounds like you have a problem with the transfer switch. It provides 12v to the furnace through the converter while on shore power, but maybe not switching over to battery after disconnecting it. Also, make sure your batteries are fully charged. Measure them without shorepower hooked up, engine running, or on generator power.

Edit: just read that your blower is running. I wouldn't think it's your board since it works fine while on shore power. Not sure how the igniter system works, but maybe it requires a certain voltage before it even attempts to fire and the blower does not...and if the blower is running, and your batteries are low, then the blower is dropping the voltage even lower.

Dunno, start with getting a good reading on your batteries.
I agree that if your reading 13.2v+ your reading batteries under charge mode. Unplug from shore, turn some lights on to take the surface charge off the plates in the bats, then take a reading. Should read 12.7v if at full charge.
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Old 06-03-2014, 11:00 AM   #13
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Quote:
Originally Posted by KyDan View Post
Explain how the defective gas valve works fine on shore power and not
on battery power??

I'm with most of the crowd here- You need to measure the
voltage AT the furnace when on shore power and then again on battery
power.
The only thing I can imagine making it act like this is low voltage when on
battery power.
Might work on 13.2 volts but not on 12.5 volts. Stranger things have happened.,
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Old 06-04-2014, 04:17 AM   #14
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Originally Posted by OldCoot View Post
Might work on 13.2 volts but not on 12.5 volts. Stranger things have happened.,
Makes sense; the minimum voltage for it to work is 12.0 volts if I recall correctly. If the solenoid is corroded, it could require a more voltage to get it to move.
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Old 06-04-2014, 07:11 AM   #15
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All good info here. Have you checked the voltage at the heater when the blower is on? Battery voltage is meaningless because the voltage could be good at the batteries and low at the heater due to bad/corroded connections.
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Old 06-04-2014, 04:53 PM   #16
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Thanks everyone. I'll pick it up from storage and look closer at the electrical contacts & measure voltages at the heater.

Dave
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