Power convertor?

Check your batts first

Switched over to 2-6v batteries about 2 months ago.

Got the batteries new from Costco. Got the newest ones they had too. What would be the process of testing them to make sure I didn't get a bad cell

I'd call this guy about the light issue: http://www.bestconverter.com/

Is the converter running all the time? Is it "whistling"? We had this issue once and I thought it was the battery. When I checked the battery it had boiled over and two cells were fried dry. So, I got a new inverter and a new battery. The inverter had blown the top on two capacitors too.
That's been two years ago and I just had to replace that battery. This time I went with a lot bigger amp battery.

Where can I find my convertor? How can I test it?

Follow your battery cables, usually the batteries are close to the converter/charger. On our previous Raptor it was located behind the main door, sort of under the stairs, had to remove the wall to the left of the storage compartment to access it.

Should be in the panel where your fuses/breakers are, usually the bottom section of this power center. Check for loose wires or undersized conductors, both have been issues I've dealt with.

Thanks guys. I'll locate the convertor when I get home. Is there a way of testing the convertor? Could something in the fuse station be bad? I've had my transfer switch replaced recently

mine did that and turned out the fan on it stopped working.