Hello from Camby, IN

[Pwinship]

Camby is SW Indianapolis, near the airport. Just picked up a new to me 2009 3665RE Anniversary Edition. Got a good deal on it (I hope) since it needs a couple of things, such as a refrigerator and tires.

I believe the tires on it are the originals because they have a date code of 2008. I plan on getting some Sailuns before taking it out on the road, hopefully in March.

I also plan on replacing the fridge with a residential model I found while searching for a replacement: a Frigidaire FFT1222QB soft-start and a 1000 or 2000 watt inverter.

Already upgraded to four 6v batteries. Which brings me to a question:
I have the new batteries in and can operate the slides, but cannot figure out how to operate the trailer on 12v. I bought the unit from a used car lot near me and it was hooked up to shore power and everything was working when I looked at it. Towed it to where I will be storing it, installed the new batteries and started exploring the trailer. All I could get to operate were the slides. No lights, no battery level indicator, tank levels, nothing. I looked around for a switch that I might have to engage but couldn't find one. The lot was no help, either. Can anyone tell me how to operate off of battery power?

Thanks,
Paul