Auxiliary Batteries won't turn on.

[Kcs735537]

I have a 2005 Fleetwood Jamboree Class C motorhome. My auxiliary batteries are under the entry steps. Prior to today when I turned the switch on, I could hear a click and the red light would come on on the panel. Then, I could check the battery charge level and operator the 12V lights and start the generator. Now, nothing happens when I push the on button on the control panel.
Could there be a fuse I need to check or something more serious. Could it be the battery disconnect switch? If so, how do I check that?

[WinnieView]

It's more likely the batteries have discharged but can possibly be charged if the coach is plugged in or the (generator is started, they may need to be jump started in they are also responsible for starting the generator).
However the switch and relay click may also turn on the converter, which is responsible for providing a charge to the batteries, so an external charger may be required.
The best bet may be to remove the batteries and take them and have them tested and charged if not replaced.

[OLYLEN]

The big boy solenoid is controlled by the chassis battery as there is a fuse on many. If the RV battery is dead you can not use the switch.

LEN

[nothermark]

Check the house battery voltage. If the battery voltage is above 11 volts then check the voltage at the big relay probably mounted to the frame rail to the left of the battery. If you have power on the input side (probably toward the battery) then the breaker is OK. If not look for a breaker or fuse probably on the right end of the battery box. If you get that far and the relay is not clunking the relay is probably the problem.

If the battery is below 11 volts start the engine and check the battery again. The charge line from the engine alternator will probably have it above 11 volts and the relay will pull in. As long as you are on shore power at that point it will probably stay in while the battery charges off the converter.

[twinboat]

Look for the disconnect solenoid, probable don't have a " Big Boy " on a class C.

There may be a fuse right on it.

Looks like this.