I am new to RV's, usually can troubleshoot electrical issues but when I am plugged into a generator or shore power, I have 12 volts but when I unplug I lose 12 volts even though the battery is fully charged. When plugged in the gage indicates fully charged but when unplugged gage indicates nothing.

Indications are its the transfer switch. If you know its location tap it and see if it will switch.

The transfer switch is for the 120 VAC system--switches between generator and shore power.Your problem is likely either a battery fuse if you have one or the DC Battery Disconnect switch has been turned off. When plugged in you are getting 12 volts from the converter. When you pull the plug the 12V is gone because the converter has no input.What is the year, make and model of your rig? Someone here likely has one just like it and can tell you where to look.In our current Itasca Horizon the Battery Disconnect switch is on the dash and easy to turn off accidentally. In our former rig it was by the entry door.

Hi harold,Nada to do with 12 volt from the battery.There may be a disconnect switch. Turn it on.There may be a circuit breaker between the converter and the battery bank. Mine are automatic but some require manual resetsThere may be a fuse that has failed.harold1946 wrote:Indications are its the transfer switch. If you know its location tap it and see if it will switch.

pianotuna wrote:Hi harold,Nada to do with 12 volt from the battery.There may be a disconnect switch. Turn it on.There may be a circuit breaker between the converter and the battery bank. Mine are automatic but some require manual resetsThere may be a fuse that has failed.harold1946 wrote:Indications are its the transfer switch. If you know its location tap it and see if it will switch.My bad, I read it wrong.

tombstn wrote:When plugged in the gage indicates fully charged but when unplugged gage indicates nothing.No, the gauge indicates voltage at the main panel.Get out your voltmeter and check actual battery voltage on the battery terminals.

No 12 Volts on battery, fully charged | Good Sam Community

12 Replies

Canadian_Rainbi
Explorer
Jun 14, 2013
The transfer switch is for the 120 VAC system--switches between generator and shore power.

Your problem is likely either a battery fuse if you have one or the DC Battery Disconnect switch has been turned off. When plugged in you are getting 12 volts from the converter. When you pull the plug the 12V is gone because the converter has no input.

What is the year, make and model of your rig? Someone here likely has one just like it and can tell you where to look.

In our current Itasca Horizon the Battery Disconnect switch is on the dash and easy to turn off accidentally. In our former rig it was by the entry door.
harold1946
Explorer
Jun 14, 2013
Indications are its the transfer switch. If you know its location tap it and see if it will switch.

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No 12 Volts on battery, fully charged

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