DC Voltage Readout or Bad Voltage

sealevel ram wrote:

DrewE wrote:
One possible place to start checking--not the only possible culprit, of course--is the shutoff latching relay for the "salesman switch".



One way to verify is to see if the voltage at the battery, measured with a trustworthy multimeter, goes down along with the displayed voltages in the RV. If the display goes down but the battery stays pretty much level, the problem has to be between the two somewhere.

Is this the House ON/OFF switch by the entrance door?
Display goes down, battery voltage stays up.

Sorry, I jumped around a bit and wasn't clear. The control switch by the door is for the disconnect and is what I was talking about--or rather, the thing that the switch connects to that does the actual switching.

With the disconnect disconnected/turned off, the house voltage should be zero (if no AC power is present or the converter/charger is connected to the battery and not the house side of things) or the converter/charger output voltage (if it's connected on the house side) and the battery voltage something else.

With it connected/turned on, the voltage at the battery should agree with the voltage shown inside. If it does not agree, there is a bad or broken connection somewhere, which might be at the actual solenoid switch that the button by the door controls but might be elsewhere. If they agree and are both low, then the battery is not being charged properly and/or is bad, as others have suggested. Basically, the idea is to measure the voltage drop between the battery terminals and the interior voltmeter indirectly by comparing the two voltages.