A black stripe would be what we refer to as a three wire. One output wire, & two small wires together in a connector. One is sense lead for regulator, other is exciting lead from ign. Many new or rebuilt replacement ones will have a third spade where the two wire connector hooks up to. It requires a different connector to get all three terminals. That one is to run a relay on other applications or a tachometer on some machines. There are two style of brush holders in those alternators. The early alternators has sliding brush and only had the two terminals, and the later alt had a swinging brush and those had the third connector which , like I said is normally not used on the tractors. The cheap part store alternators are the sliding brush style which the vibrations from the diesel engines cause those brush's to work in their holder and get a groove and thus stick.
Re: 1066 Alternator Replacement in reply to pete 23, 06-05-2014 13:50:05
Pete, thanks for the info, The one I ordered to replace the existing they call it a "3 wire", now that I know the third position is not normally used, I feel better that once I install the new one, with the two position connector, it should work....
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