I am having charging troubles on a Ford 800. The battery shows 6.4v not running and generator showing 7.4v running. The battery is not charging. I replaced the regulator and polarized (field to bat). It worked perfectly for two days and is now no longer charging. The amp meter did showed a constant charge when it was working, maxed out all the time but now shows nothing. I suspect the regulator again but it is brand new. Bought from yesterdays tractor. I checked all wires coming off the generator and they all show continuity with the chassis. Is this correct or do I have a short causing max charge and burnout? Any help is appreciated. Thanks