DC power problem

[BPConsulting]

In my Southwind the output from the converter with shore power is 12V, but when I switch to aux battery power the output drops to 6V. The batteries are new and both output 12.8V Can anyone help me?

[BPConsulting]

In my Southwind the output from the converter with shore power is 12V, but when I switch to aux battery power the output drops to 6V. The batteries are new and both output 12.8V Can anyone help me?

[Hitchhiker]

Welcome to iRV2.

The first thing I'd check is the ground (negative) connection at the battery and also where it connects to the rig's frame. After that, I'd make sure the positive terminals are good and clean.

If still only getting 6 volts at the loads (lights, appliances, etc), I'd look at the relay in the converter to make sure it was allowing the 12v DC from the battery to pass when the converter isn't powered with 110v AC.

If you have 12.8v at the batteries when disconnected from shore power and it's only 6v down the circuit there almost has to be a high resistance connection somewhere in between or a bad ground. Good luck, let us know what you find.

[BPConsulting]

Thanks for the advice. I will check to see if it's a grounding problem

[Acker1]

If your 12v system consists of a couple of 6v batteries they could have been hooked up wrong. Just a thought.
DICK