I replaced my gen. with new 12 volt alt.( older chevy p.u.) single wire. does"t seem to charge. was told I needed a bigger pulley cus the alt. wasn"t turning fast enough. with this set up what is done to wire the alt. to a volt meter on tractor. not the best at wiring. Thanks for any help.
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Phil Tibbetts
Well-known Member
D beatty is correct, you need a smaller pulley on the Alternator to make it turn faster but that is difficult because they are usually pretty small to begin with. They do have regulators for those that will kick in at a lower speed. Have you tried running the tractor at full throttle? I have one on my 364 and I have to rev it up to make the alternator kick in. As soon as it does I can return it o low RPM and it will keep charging until I shut it off. To install a volt meter all you need to do is run 1 wire + to a wire that is only hot when the ignition switch is on and the other to ground.
Janicholson
Well-known Member
A bigger pulley is just wrong. Smaller will spin it faster and that can (but does not guarantee) charging.
Making it the way GM intended will work. If you were sold a alternator with one wire conversion, it may not be the best solution, even if working. One wire systems are more or less left in the "on" state.
They will draw down the battery (depending on who made it) in from a week, to a month.
The diagrams for a 3 wire system are very easy to deal with I will give a diagram. do you have a mag, or a distributor. Jim
Making it the way GM intended will work. If you were sold a alternator with one wire conversion, it may not be the best solution, even if working. One wire systems are more or less left in the "on" state.
They will draw down the battery (depending on who made it) in from a week, to a month.
The diagrams for a 3 wire system are very easy to deal with I will give a diagram. do you have a mag, or a distributor. Jim
Owen Aaland
Well-known Member
Has the alternator ever charged for you? If it has been setting for a long while without being used it may need to be externally excited before it will again begin to charge on its own. Like a generator a single wire alternator depends on residual magnetism in the rotor for it to begin to charge on its own.
To excite the alternator simply connect the output terminal stud to the #1 terminal of the alternator.
To excite the alternator simply connect the output terminal stud to the #1 terminal of the alternator.
Janicholson
Well-known Member
Does the place on it for the plug come in from the back of it or does it go in from the top of the case?? If from the back you have to wire up a voltage regulator to it. If from the top there is a #1 and #2 marked on the case. The #2 goes to the big stud on the alternator and the #1 wire goes to the ignition switch wit ha diode or some such thing in line so as to be able to shut the engine off
Janicholson
Well-known Member
Noooooo. (not a flame, a WARNING) with an alternator, the non regulation of removing a cable can produce more than 100 volts in the system. Many things can go up in smoke, including your nervous tissues. Never remove a cable on a vehicle with an alternator while running. (not a Flame it is Flame prevention!!!) Jim
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