Converter will not charge batteries

Photomike wrote:

AnEv942 wrote:
my 2 cents- with battery on and camper AC connected, converter on- multimeter should show converter voltage at both battery & converter positive lugs.
With converter turned off (breaker) you should see battery voltage at both terminals.
If converter voltage shows at battery board terminal, Id pull the battery cable lead from converter at battery and check voltage there-should see converter voltage from converter on cable. Pulling battery lead at board terminal should see battery voltage on cable.

For some reason (short of converter malfunction) with what so far has been related- makes me think some how cable from battery is one way, only sending battery power to converter but power cant travel back. I cant see how that's possible unless whatever was added as disconnect has that function?

Everything that others are saying is correct and it should be simple to check. What I am wondering is if there is not another cut off on the line to the battery maybe to isolate it, maybe even a switch on the battery terminal. Can you follow the wires from the charger to the battery all the way or do they disappear behind a wall someplace? If you have zero 12v working when inverter is off then something is shut off.

I would run two lines from the charger to the battery across the floor and then see what happens. This would tell you if it is the lines that are installed.

Many old units did not have a battery, they only ran the 12v when they were plugged in or from the truck.

There was a break in the weather it's now +1 Celsius and I was able to get into the TC. With the converter turned off I hooked the battery directly to converter. I then turned on the converter and checked the voltage across the converter and it was 13.5 volts. The voltage across the battery was 13.0 volts. I then put a load on the battery and the voltage dropped to 12.7 volts, however, the voltage across the converter remained at 13.5 volts. This process would remove any wiring concerns and should test just the converter...I hope? Is the converter at fault?

I also checked the battery wires from the fuse box and it is connected to directly to the truck plug. There is a fuse between the truck plug and the fuse box but connecting the battery directly to the converter should have bypassed that fuse. I don't want to buy another converter at +$200 if I can help it. Any further advice?