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Re: Generator Woes(Alternator Conversion) Farmall C
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Posted by RK Smith on April 22, 1999 at 19:51:44:
In Reply to: Generator Woes(Alternator Conversion) Farmall C posted by RJB on April 22, 1999 at 19:15:41:
When you convert to 12V neg ground, the starter will continue to spin the same direction, because the polarity in the "field" and "armature" circuits are both reversed, so the spin is the same. I just did it on my H. It won't hurt the starter, but it will really zing it, and you may want to pull the starter and look at the starter drive gears for broken or worn teeth, so that the starter drive won't damage the ring gear. Starter drive should be about $50 and takes 10 min to replace. Don't damage the "brushes" and just watch as you disassemble and reassemble the same. Do it in steps. First, make sure for yourself that the system will work by reversing the polarity of the battery. Disconnect battery and observe ignition. Should look like this: distributor to (-) coil (+) to ballast resistor(only when you get the 12V battery) - to switched side of ignition. Now, flip the 6V battery around in the tray, and ground the neg side to the starter mounting bolt, and the pos side to the starter relay. If you have the push type simple starter switch, then run the cable from there to the terminal on top of the starter. Note this is just reverse as to how it was. The coil is not polarity sensitive, so if the above was correct, leave it that way. Also, you don't need the ballast resistor until you decide to convert to 12V. Now crank the tractor and see that it runs to your satisfaction. All OK, find a Delco-Remy alternator (either an internally regulated one or one that needs an external voltage regulator) - and then you will either need one line to the switch from "BAT" on the alternator, or the "same" and one additonal line from "field" on the alternator through a voltage regulator to the same switch post. Now you will need the ballast resistor between the coil and the switch. You can leave the ammeter as is if you want to (it should be in a loop with the switch, so that it is in series to pos voltage from the alternator), but it will register in the reverse unless you reverse the connections to it. If you need a voltage regulator, try 129965 VR706 at AutoZone. It's simple, two wire, electronic, and about 10 bucks. The line from alternator "field" goes to a terminal on the VR labeled "field" and then the terminal marked "ign" leads to the switch. All set. When everything is finished carefully review, and then reconnect the battery (now must be 12V and **MUST BE** neg ground and start the tractor. If the battery is discharged to any degree, the alternator will register charge on the ammeter, until the battery regains charge and the VR kicks it down. Good Luck. RKS
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