One Wire Alternator for 3 Cylinder Tractor

CTPhil

Member
I'm putting a one wire alternator on my 4100. I've ordered a pulley for it (it came with one for a 3/8" belt), and while I'm waiting would like to get a jump on getting a belt. The pulley is a smaller diameter than stock. I'm assuming I'll need a smaller belt. For those who have done it, how much smaller of a belt will I need?

Thanks.
 

I took the pulley off the generator and had it bored to fit the Delco but most time there's enough adjustment to use the standard belt with a smaller pulley.
I prefer using the 3 wire Delco setup, simple install and retains the charge light on the dash.
 
(quoted from post at 12:45:26 07/29/19) Why go with a one wire?
It is sooo easy to go with a three wire
on a 3 cyl tractor and then the original
warning light still works.
With a one wire I don't have to figure out where all of the wires go or if the rectifier works, lol. But also I'm planning to ditch the instrument panel and go with a 3 gauge replacement that will include an ammeter.
 
I put the alternator on today, it took a little modifying but nothing major. I ended up with a 54" belt, the original is 55" plus.
 

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