Hello, New to the Forum looking for some guidance. Have a Generac 6500 that produces power in the 12v battery charge outlet, and Makes AC in the round 4 prong 120/240 outlet only. I replaced the Regulator, but that's as far as I got. I was thinking of replacing the control board, but it's pricey. I'm good with a wrench, but slow in the electrical dept. Any Input appreciated.