12 v alternator for allis chambers b

Obviously, alternator speed is what matters.

Often, the crankshaft pulley on an old tractor is not as large as the pulley on a typical V-8 car engine the alternators were designed for, and the alternator ends up running much slower than on the car where it was original equipment.

Likely, no problem with a 3-wire unit, but MAY be a problem with a "one-wire" unit.

Did you take a look at Bob M's diagrams, to see how easy it is to do it the right way?

Also, for more alternator tech info, take a cruise around the MAD electrical site linked below. It's hot-rod oriented, but the alternator tech applies ti old tractors, as well.

• MAD electrical

Bob Melville, over on the Farmall board, has drawn up and posted a series of wiring diagrams to convert IH tractors to 12 Volt systems, with alternators.

I've linked his diagrams below.

Whether you have a distributor, or a mag, there will be a diagram that will work for your Allis.

Be smart, use a standard, as-original 3-wire alternator.

They are the cheapest to buy, the easiest to find, charge at lower RPM's, and cause less parasitic drain on the battery during periods of non-use than the deceptively simple "one-wire" units.

• Bob M's diagrams

John T