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John Deere Tractors Discussion Forum
Show Parts for Model:

Wiring an Alternator on tractor

Author  [Modern View]
Craig G

09-28-2010 09:14:58

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Hello All,

On a 1951 B, how would you wire an alternator?
My dad is trying to figure out how.
Any advice would help.


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rlp in Co.

09-29-2010 11:15:11

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 Re: Wiring an Alternator on tractor in reply to Craig G, 09-28-2010 09:14:58  
Click on articles, on the left side of this page and read all the atticles that pertain to batteries and alternaters.

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rlp in Co.

09-29-2010 11:14:56

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 Re: Wiring an Alternator on tractor in reply to Craig G, 09-28-2010 09:14:58  
Click on articles, on the left side of this page and read all the atticles that pertain to batteries and alternaters.

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John T

09-28-2010 10:15:16

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 Re: Wiring an Alternator on tractor in reply to Craig G, 09-28-2010 09:14:58  
Heres how I wire a GM 10SI Alternator on tractors with a battery/coil ignition and remember, it requires NEGATIVE GROUND !!!!!!!

The big rear main alternator output terminal goes to and splices into the wire that used to be connected to the BAT terminal on the Voltage Regulator or Cutout Relay, but basically, the alternator output wires to the Load (NOT battery/starter) side of the ammeter which takes place if you use the wire that used to connect to to the BAT terminal on the Voltage Regulator.. HOWEVER if that wire wasnt already upgraded, when I convert from a Genny to an Alternator, I replace that wire with a 10 Gauge and it runs from the alternators main output up to the LOAD (NOT to battery/starter) side of the ammeter. I also replace/use 10 Gauge from the ammeters other SUPPLY terminal to the battery/starter.

The alternators (if a GM 10 SI) little side number 2F Voltage Sense Terminal gets connected (use a short 14 jumper wire) right up to and with the big main output terminal mentioned above.

For the GM 10 SI's little 1R side Excitation Terminal, run a 16 or so gauge wire from the ignition switches IGN (which is hot ONLY when ignition is turned on) output terminal ORRRRRR the coils high input (NOT to distributor) terminal, and in series with it place a 10 ohm to 47 ohm 5 or so watt current limiting protection resistor . Then in the rare event (likely dont even need a diode if the resistor which I prefer is used) the tractor continues to run cuz of alternator backfeed when the ignition is switched OFF, I add in series a 5 amp 50 PIV minimum Diode. The diode must be wired with negative cathode end to the alternator and positive anode end to the switch. Again, the ratings are not that exact but about any diode over a few amps and 50 volts or so works.

Dont forget to change the battery to negative ground and the coil needs to be wired so the negative goes to ground via the distributor points and the positive gets power from the ignition switch and you have to reverse ammeter leads also if you’re just now changing polarities cuz if its wrong it reads bass ackwards.

Good luck Ol John T in Indiana

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AF 70

09-28-2010 09:36:00

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 Re: Wiring an Alternator on tractor in reply to Craig G, 09-28-2010 09:14:58  
You might do a search on johnnypopper, there's been a lot about it on there at different times. I studied on it quite awhile before I went to a generator shop locally with my list and diagrams. As I started my spiel, the counterman walked away and came back in a minute with a little arrangement of wires already made up and told me what to do with them. Uh, electronically that is. I think it cost me $10-15 + the alternator from Advance auto for $30, I think. I had to fab up a mount, but the wiring part took about 30 seconds. So you might make a call or two and see if your luck could be as good as mine was!

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