WJSchrock

[WJSchrock]

How do you test magnetic alternator on John Deere 4100 tractor.

 

[smstonypoint]

How do you test magnetic alternator on John Deere 4100 tractor.

You will increase your chances of getting an answer to your question if you post your question (with a descriptive title) in http://www.tractorbynet.com/forums/john-deere-owning-operating/.

Good luck.

Steve

 

[deerseeker001]

Welcome from Wisconsin

 

[pmsmechanic]

I have no idea what a magnetic alternator is. You can test a normal alternator a volt meter. When the tractor is running at about mid throttle the volts should read about 13.8 - 14.2. Right after starting it can read up to 15 or so volts for a short time. If you don't have a volt meter then hold a metal screwdriver or similar to the rear bearing on the alternator. If the bearing is magnetized then the alternator is charging. More magnetizm equals higher volts.