problem with electrical system

Also let me state and this might be important. The battery was hooked up wrong. I was assuming yes I know the old saying. That the RV 12 volt system was like a car and the black wire was neg and the yellow wire must have been pos. but I knew something was wrong when my bathroom and microwave fans were not blowing through the vents they were trying to pull. That's when I had an epiphany that they were running in reverse and the battery was hooked up backwards. That's when I moved the black wires to pos. and the yellow to neg on the battery posts. Now the fans run correctly but the fuses keep blowing. I bought this RV used about 7 years ago and only used it 4 times during ythat time period and forget sometimes how everything works.

I just changed the plugin to another exterior outlet. these are standard electrical outlets. The outlets work in the rv as well as the microwave. But the fridge won't work neither will the interior lights until I turn the disconnect to the on position. But when I do the 2 30 amp fuses bloe on the converter. I have two black wires run to the positive terminal to the battery as well as a yellow wire run to the negative. the yellow wire is also ground to the frame. Also at least 1 of the black wires goes to the disconnect.

The IntelliPower 9100 is a Converter Charger NOT an Inverter!

It does make 12V DC from 120 V AC. Inverters do the opposite of that.

You sure the batery is hooked up properly. Or that your 20A shore connection is wired correctly?

I was under the impression that the Intelli Power 9100 used AC to make DC?

I'm more curious about your "home outlet 20 amp service"

The battery disconnect shouldn't make any difference - it is DC and your shore power is AC.

Same with the inverter, it is running off of DC to make AC - which you don't need when you are on shore power.