I am working on a John Deere 4100 narrow. I have replaced the voltage regulator with a new one from John Deere. I have 40 volts ac at the terminal connecters at the alternator wires at the regulator ; disconnected. Ihave battery voltage on the battery voltage sensing wire at the regulator. I only have 17 volts at the alternator wires connected to the regulator. Battery will hold a charge until it is used up. Can anyone help me on where to go from here?

Charlie, August 2009

The battery not getting charged, check voltage at B on regulator, if higher then the battery volts, check wire from B back to battery.

Johnny Longtoe, August 2009