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Discussion Forum

Re: Charging question

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Steve in N.J.

12-27-2002 21:00:32

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Sounds like you have yourself a one wire alternator there. If it has a rubber plug in the top of it where the two wires would go to trip the regulator. The problem you are experiencing with your alternator, if it is a one wire, is it needs to spin up to 1500-1800 rpm in order for it to "excite" the regulator to make it charge. One wire's work great for cars, trucks, and street machines, but not tractors. Because tractors operate at low rpms, it doesn't spin the alternator fast enough to excite it to charge. Some folks put smaller pulleys on to make em' spin faster, but if you are still using the "fat" belt, it's tough to find a small wide pulley that will work. You're better off putting the same type alternator on, but a "2 wire" which utilizes the "sense" circuit to signal the alternator to charge as soon as the engine fires and runs. I can fix ya up with another alt. Drop me a line and I can get ya goin' again. I'll be away most of the day tomorrow (Saturday) (going to p/u a WD with a friend) but when I get back I'll e-mail ya.
Talk to ya later! Steve B.

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Doug in OR

12-29-2002 11:19:01

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 Re: Re: Charging question in reply to Steve in N.J., 12-27-2002 21:00:32  
Even with a one-wire system, it should work. The only difference being that it won't charge until you spin the engine up to a higher RPM. What does concern me is that 11.xx reading you get with the lights on. With a fully charged battery, turning the lights on should have little effect on the voltage - it should stay around the 12.2 to 12.4 range. I would recommend that you check the pulley size on your alternator first. Ideally you want the alternator to be turning at 1200 RPM at idle. Considering that most tractors idle at 450 to 475 RPM, you want a ratio of about 2.5:1 or faster. This can be hard to get, but try to find a pulley that is at least one half the size of your drive pulley. Go smaller if you can. I would double-check everything, especially that battery. I smell a rat with that battery voltage when the lights are on - unless the battery is not charged up.

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