Power convertor?

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.

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

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.

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

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

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

Check your batts first