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Discussion Forum

Re: Charging?

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12-10-2002 15:58:11

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this alternator is a common upgrade on an old tractor. you just change to a 12 volt battery, switch the battery to negative ground, pput a resistor in the coil line ifit has a distributor, and change the head lights. The alternator has an internal regulator and takes care of everything. NOw for the bad news. THe post on the back (1/4 inch lug) is the hot output to the ampmeater, then battery. The two small spade terminals on the side make the regulator work. one is hot all the time and can be connected to the big lug. the other is a kindof excitation voltage and needs to be somewhat less than 12 volts. I install a 10 ohm, 10 watt resistor in the line to drop the voltage and make it want to charge. Without a resistor or light bulb element in the line, you wil need to get it turnign about 2-3000 RPM before it will "kick in" and charge. That could be the problem. Also if the battery is connected backward for just a minute, you can burn out the regulator internal. Check battery voltage with a digital volt meter.. Probably will measure about 12.5 volts. Then start the tractor and remeasure the voltage. Should be about 13.5- 13.8 volts. IF not, it probably has a bad regulator, or the resistor lead wire is not connected. Check it out, then go to Auto Zone and have the alternator tested for free. If it is bad, change it out for $35.

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