I have a 1997 Fleetwood Southwind 35' wide body 450/454, with two 12 volt batteries and I think there's an extra cable hooked up to the positive side of my motor battery. Having electrical problems ...
Cable should be #2 or bigger. Wire should be 12 or 10ga. could be a fusible link.....if it's smaller than a 12ga wire it would indicate an accessory...Dennis