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Old 10-09-2012, 11:38 PM   #1
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Question seem to have `lost' my 12V power

I have a 1988 Winnebago Superchief (32')
it has new batteries (engine and 2 deep cells in step for the motorhome.
BUT unless I am plugged in to 110volt power I do NOT have 12 volt power (lighting, the control panel above stove - for water pump, indicator lights, clock, etc.,)... I used to but don't now... where/what do I check to return my 12 volt lighting to it's former state? it's my 1st motorhome - be kind please!

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Old 10-10-2012, 03:50 AM   #2
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If your 110 plugs are working you need to look at the 12volt fuse box and converter. The converter should have 2 fuses either on the front or back side. The 12 volt fuses should be easy to check. If you do not have 110 at these locations you need to look for a tripped GFIC plug and reset

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Old 10-10-2012, 07:01 AM   #3
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To clarify: you are saying that the 12 volts appears when you plug in to shore power, disappears when you unplug, and reappears when you plug back in. Is it both the house and the chassis 12 volts that disappear (i.e. do the overhead lights and the headlights go out when you unplug)? If I have the symptoms correct so far, it sounds like the batteries are no longer connected to the 12 volt circuit, but the charger still is. This would imply that a heavy duty switch/breaker/fuse near the batteries is off.

If you use a multimeter to check the voltage at the battery terminals, is it near 12 volts? Does it start to rise to 13 or 14 volts when you plug in?

As with any troubleshooting of something that worked and now doesn't, ask the question "What changed between then and now?". Any shop work?

Do you have a fuse or disconnect mounted to the battery terminal or very close to it?
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Old 10-10-2012, 07:58 AM   #4
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Agree - you have a battery disconnect in the 'off' position. Or a fuse/link from the batteries blown..
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Old 10-10-2012, 08:06 AM   #5
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Did everything work before the new batteries were installed?
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