Chuck:


Are we talking about the balance light on the dash? I always assumed that this would monitor the chassis batteries only. I would think that the house battery Vanner would have its own monitoring system. If it is the dash light, and the chassis vanner has a green light, then it might be the monitor that is bad. I have read that these fail more than the Vanner itself.

To check the Vanner you need to have the green light on. If it is not on and it is working properly, turn on some larger 12 volt loads and the green light should illuminate. With the green light on, check the voltage between the 12V and GND terminals. Then check it between the 12V and 24V terminals. The 12V/24V measurement should be equal to or not greater than +0.1V compared to the 12V/GND measurement. As an example, if the 12V/GND reading was 13 volts, the 12V/24V reading should be between 13 and 13.1 volts.

So, let us know what balance light was on and how the above test works.

BTW, with the readings you provided, I assume that the engine was running? I would do the test without it running.