'06' monarch House electronics not working.

Question

Just returned home from a short 100 mile RV trip and when I shut the engine down none of the house electronics ie. lights, slides, water pump... would work. When I restarted the engine, they would again operate. They would also work when plugged into shore power. Both the chassis and house batteries are showing ~13vdc with the engine off and no shore connection. The house batteries are 4 Interstate 6vdc deep cycle batteries in the traditional 2s-2p configuration they are 3.5 years old and have performed flawlessly from day 1. An inspection of the electrolite levels shows all of the cells at 1/4" or greater above the plates. I have a 4 stage converter which is always plugged in when parked. Anyone have any ideas as to what the issue might be?
Thanks
-Rick

bruce_brown · Answer

Is the 12v cutoff switch on?

tom_barb · Answer

The main battery negative cable is off, broken continuity , or
If the main disconnect switch is open, nothing woks on the alternator, or the 50 amp cable.
the engine alternator has it's own ground, as does 50 amp circuit.

rickavery · Answer

Thank you for your replys, yes, I've checked the cut-off switch and it appears to be working properly. There is also a hard disconnect in the battery compartment which disconnects the main positive lead in which case, nothing is activated and this is also working correctly.
I will check out the negative cables in the morning.
Thanks again
-Rick

archhoagland · Answer

Have you measured the voltage at the house battery terminals with a voltmeter?

rickavery · Answer

Thank you for your reply. Yes, the house batteries are at 13.0vdc.Does anyone know where the battery boost relay is located?Thanks-Rick

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'06' monarch House electronics not working.

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