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In Reply to: John Deere 4020 tractor posted by Tom Barlette on Wednesday, October 22, 2003:
What? Not sure what Jerry is talking about...
Anyhow,
The serial number plate is located on the rear axle differential housing, at the rear of the tractor, below and to the right of the toplink mount, below the hyd remotes, likely covered in dirt, grease, oil, mud, and crap.
If you don't know if you have a 24 volt system or not, go ask a mechanic to look at it for you. You clearly have no idea what you are doing!
The starter and generator will both be tagged with the info, and at minimum they will have part numbers that you can call your Deere dealer with and find out what you have (12 or 24 volt). You also can look at the batteries and how they are hooked up. Do you have (2) 6 volt batteries or (2) 12 volt batteries? How are they hooked up? In parallel or in series? If you have (2) 12 volt batteries and they are hooked up in series then you still have a 24 volt starting/charging system. Series means that the one cable goes from the (+) to the starter solenoid. The other cable goes from the (-) of that battery to the (+) of the other battery. Then, the (-) of that battery goes to ground. Series circuit. All of the accessories on a 4020 tractor are 12 volt, meaning the lights, gauges, etc. It is called a split-load design. There is a negative battery cable that rots off these tractors near the right rear fender that is critical for the split-load 12 volt design to work properly. Very few people know or understand this. Contact a good JD technician and he should be able to assist you in understanding this.
I'm tired of typing anymore - sorry.
Good luck!
Andy