Ok,I know a little. My 1949 8N 6volt was not charging the
battery, and I needed a jump. I resorted to using a 12 v jump
box, negative to starter post and positive to frame, started
fine and proceeded cutting. It shut off after 45 min, so I boxed
it again. Started right up,for another 45. Boxed it again and
went for a couple hours, and shut it off. Thought the voltage
regulator was bad so I bought one here. Transferred the wires
one to the other, and when I reconnected the freshly charged
battery, there was a spark when I connected the ground
(positive) terminal to the battery. Within seconds the ground
wire between the generator and voltage regulator burned the
insulation off. Checked the battery to make sure about the
positive ground. Swapped back to the original regulator, and
same thing. Just touched the negative terminal to the post,
and sparked. No headlights, key off. How do I diagnose from
here.