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Mend John Deere 4100 Tractors

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Mend John Deere 4100 System

charging system diagnosis?

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
John DeereJohn Deere 4100Vehicles, TractorsSystem John Deere
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

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