Need to get some model numbers...
The CONVERTER is usually a part of the Power Distribution System where the circuit breakers and fuses are located.
The CONVERTER unit is powered up by 120VAC from a circuit breaker and produces 12VDC at the model specified DC CURRENT.
Normally you can disconnect the DC Cables from the + and - Terminals of the converter and when you turn on the 120VAC then it will will produce 13.6VDC without tripping the input 120VAC circuit breaker. If it trips the breaker then the CONVERTER unit is most likely the problem. If it trips only after connecting the + and - CABLES back up to its output terminals then there is SHORT CIRCUIT on those the BAT cables.
I am not familiar with your three power switch positions. That must be some sort of power panel.
Most converters are a standalone type unit. Mine is a PD9260C which comes with a standard 120VAC cord that plugs into a 120VAC receptacle. It does not have any OFF-ON Power switches. You plug it in to the 120VAC Receptacle it comes ON.
Then I can measures the DC VOLTAGE at the + and - terminals which will normally read 13.6VDC but could also read 13.2VDC or 14.4VDC depending what smart mode it is in.
Really hard to do any troubleshooting unless one knows the model numbers involved.
My 2008 Starcraft 14RT POPUP trailer originally came with a ELIXIR MDL ELX-30 30AMP COnverter unit which had a couple of 120VAC circuit breaker positions and four 12VDC fuse position. This unit only produced 13.6VDC @ 30AMP DC Current.
I changed all of this out for a bigger WFCO 8900 series power distribution center to provide 5 large size circuit breaker slots and eleven 12VDC Fuse positions. This also had a bottom compartment for a WF 8945 COnverter unit which I didn't like the way it worked and used a PD9260C COnverter stand alone unit in its place.
Bottom line is we need more info to discuss troubleshooting of the problems...
Roy Ken
