Our heavy duty USA made Voltage Regulators for the "D" series Tractors. A nice flush mount VR that gets mated to your Generator. Before ordering, we need your Generator number so we can hook you up with the correct VR that will work with your particular Generator.  Also available in a curved mount for Generator mounting like our 6V unit our P/N 1514A-08. VR is used for 12V Neg. Grd. or 12V Pos. Grd.