Hi there, I am looking at the photo of your engine and there seems to be something incorrect in the way the cut out on top of the generator has been wired. The battery cable is on the rear of the cut out but should be on the front terminal, ie radiator side. The wire coming out of the generator should be on the rear terminal of the cut out. This means battery current is going directly into the generator armature and if left on too long will burn out the gen armature and flatten the battery. Actually the cut out has been bypassed. Check it out. Good luck, Regards, Kevin.