Quote:
Originally Posted by grouchotoo
12 volt electrical problem on 2007 Winnebago Adventurer 38J
House 12 volt electrical system is not working when not connected to shore power. It does work when connected to shore power. No 12 volt power even with engine running.
Batteries show a full charge (two 6 volt batteries wired in series) and none of the 12 volt circuit breakers are tripped—either the ones under the stairs or the ones below the fridge. The breaker panel under the stairs says that there are solenoids and relays behind the panel but I haven’t taken the panel off to look at them.
Generator will not start whether engine is running or not.
Aux battery switch is on.
Any ideas as to the problem?
Thanks.
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It is possible you have multiple problems.
When you are connected to shore power, your converter supplies 12v power to everything. Actually, more specifically, it has a charger that charges your coach/house batteries and those provide 12v power to your coach. I believe this is how it should work.
First thing I would do is determine if your coach/house batteries are any good. Let them sit without shore power for a few hours. Then measure with a volt meter (or if you have a battery monitor). Are they at 12.6v? (fully charged) Are they at 10.5v? (dead) You can also pull them and take them to an auto parts store and ask them to check if they are good or not. If they are bad, that could be why your RV has no power when you are not plugged in, and it could be the reason why your generator won't start (dead batteries).
Next, with your batteries connected (assuming they are healthy), I would test your isolator solenoid (that comes from the chassis alternator). First, measure the voltage on the coach/house batteries (not the chassis battery). Then, start up your engine and check the voltage on your chassis battery (this should be 13.5-14.5v and will tell you that your chassis alternator is working properly). Then, with the engine still running, check the voltage on your coach/house batteries. If your isolator solenoid is working properly you should see that your batteries are getting charged at 13-14v. If not, your isolator solenoid is not working. The good news is that is relatively easy to fix and it is inexpensive.
It sounds like you might just have dead batteries.
Let us know what you find out.
-Chris
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2 x 2015 Thor Majestic 28a 30' Class C. Ford e450 v10. 500w solar. 2000w inverter. 200AH
2013 Coachmen Leprechaun 210QB 23' Class C. Ford e350 v10. 300w solar. 1100w inv. 220AH
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