This message is a reply to an archived post by jollymon on October 27, 2014 at 08:44:23.
The original subject was ford 800 voltage regulator.
Hello, I have been having the same problem as jollymon. I have a Ford 800 with a 12V positive ground charging system. When I start up the tractor, there are almost 16V across the battery (with the correct polarity) and my ammeter pegs out at 30+ charging amps as if there is a dead short in the charging circuit. I rebuilt the generator already and re-wrapped the windings. New brushes, new brush springs, and a clean commutator. It motors just fine and with the correct rotation when I bench test it. The battery is brand new off the shelf today. Connection between ground and voltage regulator casing has good contact. The first voltage regulator I tried burned up exactly the same way jollymon described. Burned up winding around the reverse current coil and the plastic holding the coil bracket melted and smoked. It was supposed to be a 12V regulator for a positive ground system. I put a new voltage regulator of the same type on and took the cover off to observe the points when I start the tractor. The points for the reverse current coil close properly to allow charging, so I know my current is flowing the correct direction and the generator is correctly polarized. However, the points on the voltage regulator coil, which should be vibrating between open and closed to prevent the exciter field from maxing out don't even twitch. They remain firmly closed, so the output from the generator is not being regulated. When I manually open the points of the voltage regulator coil with a plastic brush handle, my ammeter reads zero charging current. It's like the electromagnet in the voltage regulator coil is installed in the wrong direction. I've traced my wiring and checked for any other ground shorts, and I can't find any. Any help would be greatly appreciated.
The original subject was ford 800 voltage regulator.
Hello, I have been having the same problem as jollymon. I have a Ford 800 with a 12V positive ground charging system. When I start up the tractor, there are almost 16V across the battery (with the correct polarity) and my ammeter pegs out at 30+ charging amps as if there is a dead short in the charging circuit. I rebuilt the generator already and re-wrapped the windings. New brushes, new brush springs, and a clean commutator. It motors just fine and with the correct rotation when I bench test it. The battery is brand new off the shelf today. Connection between ground and voltage regulator casing has good contact. The first voltage regulator I tried burned up exactly the same way jollymon described. Burned up winding around the reverse current coil and the plastic holding the coil bracket melted and smoked. It was supposed to be a 12V regulator for a positive ground system. I put a new voltage regulator of the same type on and took the cover off to observe the points when I start the tractor. The points for the reverse current coil close properly to allow charging, so I know my current is flowing the correct direction and the generator is correctly polarized. However, the points on the voltage regulator coil, which should be vibrating between open and closed to prevent the exciter field from maxing out don't even twitch. They remain firmly closed, so the output from the generator is not being regulated. When I manually open the points of the voltage regulator coil with a plastic brush handle, my ammeter reads zero charging current. It's like the electromagnet in the voltage regulator coil is installed in the wrong direction. I've traced my wiring and checked for any other ground shorts, and I can't find any. Any help would be greatly appreciated.
