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Subject: 12v charging

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Tim Couch    Posted 03-30-2023 at 13:33:27 [URL] [DELETE]        [Reply] [Email]  
  • 12v charging
  • I'm working on a 51' with a 12v conversion that was done before I got the tractor. To get it charging I always had to rev it to almost full throttle, now that doesn't work. I took the alternator in to get tested and it passed.

    It is currently a 1 wire, and the other two terminals had silicone on them, it is now removed.

    I wired the #2 terminal to the output terminal. Then I wired #1 terminal and left the other end open. I started the tractor and then touched the #1 to the output stud very quickly, it started to charge.

    I've read about installing a light which would excite the alternator. Does anyone have the bulb and socket part # that I need? I've read about a 2 or 3 wire socket and that is where I get stuck.

    Thank you,


    Tool Pro    Posted 04-02-2023 at 05:08:41 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 12v charging
  • Tim, I've done quite a few 12V conversions on both front mount and side mounts and never have used a lamp. I always tried to use a 12V coil and if customer didn't want it I'd add the external 1-OHM ceramic resistor and never had any issues. Is the rest of your wiring correct? Did you remove the voltage regulator from the 12V circuit? You used to be able to go into town at your local Radio Snack outlet and get the diode but RS is no longer in business. Other electronic suppliers are around though.

    Tim Couch    Posted 04-05-2023 at 09:04:22 [URL] [DELETE]        [Reply] [Email]  
  • Re: 12v charging
  • Thank you for the reply. I'm fairly certain the wiring is correct and the voltage regulator has been removed. I ordered a diode kit today and will install it this weekend.


    Bob in KS    Posted 04-01-2023 at 09:44:02 [URL] [DELETE]        [Reply] [Email]  
  • Re: 12v charging
  • an alternative to the lamp is a 3 amp@50 volt or greater diode. Wire between #1 on alternator and ignition switch with marker band on diode toward alternator.

    Or a 10 ohm 10 watt resistor wired as above. With resistor it doesn't matter which end is connected to either side.

    Bruce(OR)    Posted 03-30-2023 at 23:12:43 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 12v charging
  • The light bulb might be enough to activate the charging system. Then again, maybe not.
    What you need to locate, and minimize the playing around with, is a voltage regulator that excites at a low RPM. Then take apart the alt and replace the VR with the different one. Then it should work without fail.

    Mike Maiman    Posted 03-30-2023 at 17:33:06 [URL] [DELETE]        [Reply] [Email]  
  • Re: 12v charging
  • Tim,
    If you are running a Delco alternator you might find this website helpful, myfordtractors.com. Search for the article "Deep Delco". Regarding the side marker light mentioned in the article I opted for a Standard Ignition 2 terminal light socket p/n S74,($6.29) which takes a bayonet style dash light bulb. I idle my tractor at 550 to 600 rpm and that keeps the dash light off and alternator charging. Hope this helps and good luck.

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