I have a 1995 Newmar Kountry Aire. While checking the slide operation, it extends fine but stops after about 6 inches of retraction. All obstructions are clear. Is there anything that needs to be unlocked, before you retract it? To extend it you have to unlock the bar behind the drivers seat. The battery that I'm using is a starter battery, new and fully charged. I'll be installing 2-6volt for the house bank soon. Will deep cells make a different on the slide operation? Thanks for all the help.