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Re: help with 12 volt conversion
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Posted by farmallhal on January 03, 2005 at 18:50:17 from (216.106.33.103):
In Reply to: Re: help with 12 volt conversion posted by jeff smith on January 03, 2005 at 16:02:00:
Jeff, I converted my 1951 H over to 12 volt a couple of months ago using a Hitachi 14231 alternator which is a little smaller then a Delco 10SI. I haven't seen in your posts what alternator you used and it probably doesn't make any difference. With the Hitachi #1 is the L terminal and #2 is the S terminal. I used Bob Melville's wiring diagrams on this site which you are probably using as well. I didn't use the light you are discussing in your posts but placed a 10 ohm - 10 watt resistor from Radio Shack (about $4 for a twin pack) in the light location in the circuit. I believe the light and/or the resistor is to excite the alternator to turn on and produce current. One thing that is different with an alternator on these tractors is the engine speed isn't like an auto engine which runs at a higher RPM. You need a small pulley on your alternator to increase its RPM's from the slower turning Farmall engine. Mine with the 10 watt resistor in the circuit in place of the light turns on at a normal idle starting speed. Also, did you notice the short pigtail wire from the 2 terminal to the BAT terminal? I guess that has to be in place as well. Have you installed a ballast resistor to reduce the current to the points to 6 volts? I used a RU12 as a ballast resistor as it passed closer to 6 volts to the coil and point then the one noted in Bob's article. Other then what I've noted above I don't see what could be wrong if it is wired per Bob's diagram as my H worked perfect from the start. It might be best to stand back a minute and just follow one wire at a time and make sure it is correct. I've unlocked my email if that works better for you. Good luck and you will like it once you get past these start up problems. Hal
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