Which post is which on generator on a 1975 sportster?

nope if it bolts up make sure the wires are red (A) armature (F) field and battery pos + make sure u polarize the genny by making a jumper wire from (A) ON GENNY TO POSITVE ON BATTERY TILL IT SPARKS NO LONGER THEN CHECK VOLTAGE SHOULD PUT OUT 12V TO 14 V WHILE RPM IS 2000

I can't say that I have ever run into this problem before. The brushes are on the outer end of the generator from any oil and not readily available for oil to get on them. The bike would have to have a terrible rocker box leak and the protective band would have to be off. But, I guess it's possible for oil to prevent a generator from charging. It's simple enough to pull the end off the generator and clean up the commutator ring and the brushes. Make sure you polarize the generator when you put it all back together by momentarily shorting the armature terminal of the generator to the positive post of the battery.

Good Luck
Steve

The green wire goes to the Field and the two Tan wires go to the Armature. Make sure that you "polarize' the generator by momentarily arcing the positive battery terminal with the armature terminal of the generator with the generator and regulator on the bike and hooked up before starting the engine.

Good Luck
Steve

best talk wit an accredited auto electrician as some alternators are internal voltage regulated and others are externally regulated
it will depend on the alternator you intend tofit

First off, an '82 Sportster does not have an alternator. Sportsters didn't come out with alternators until late 1984 and then they were located behind the outer clutch drum.

Now if your bike is an 1982 model with a generator on the front of the engine, there should be three wires going to the generator. One green wire goes to the "Field" terminal and two tan wires go to the "Armature" terminal.

Don't forget to "polarize" the generator but momentarily arcing the generator's "Armature" terminal with the battery positive terminal. The regulator should be connected to the generator.

Good Luck
Steve

This is unusual since the generator is usually pretty tough. I've got one question. Are you properly "polarizing" the generator? To "polarize" the generator, you need a piece of wire that will reach from the battery to the generator.

"With the generator on motorcycle and connected to regulator, connect one end of a jumper wire to the generator armature terminal. Momentarily touch the other end of the jumper wire to the positive terminal of the battery. This restores the magnetism, Remove the jumper."

This is directly out of an H-D service manual. The 'polarizing" procedure should be done anytime any part of the charging system is removed from the bike. Since a generator produces a DC current, this insures that the current is of the correct polarity.

Also, make sure that the voltage regulator that is bolted to the frame is well grounded. It depends on this ground to regulate the voltage. We usually put one of the "star" type lock washers between the regulator and the frame on each of the mounting bolts. The teeth on the washer dig into the frame and the body of the regulator providing a good ground. And, make sure that you've got the wires properly connected. The green wire goes to the "Field" terminal and the two tan wires go to the 'Armature" terminal. If you need a complete schematic, contact me directly at [email protected]

Good Luck
Steve

please search for a hd specialized manual-bookstore or library may also havum

The armature (rotating field) is powered by the voltage regulator for 'excitation' which is the term describing a magnetic, revolving field. This magnetic field 'induces' voltage into the stator windings (stationary outer winding), producing voltage for use at the recepticles. Some older generators used a 'permanent magnet field, instead of using a powered winding from a regulator and the voltage and frequency were set by the RPM.
Frequency is still a function of RPM, but the voltage is controlled by the voltage regulator.


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try replacing your regulator as the diodes may be stuffed or on way out