You best find a new store that does not rip you off like that. Our local auto parts stores are right at the $50 mark for 1 or 3 wire with the same warrenty. Do it right and that 1 wire alternator will serve you well. #1 do not buy too large a model, no sense putting a 60 or 72 amp 1 wire alternator in an application that originally had a 20 or 30 amp 6 v generator. A 37 amp 1 wire alternator will self excite at 1/2 or less the rpm of a big 60 or 72 amp model. That and Use a small drive pulley on the alternator will get you a 1 wire setup that will self excite at fast idle or less. They are a especially slick unit for a mag equipped tractor where you have only the mag kill switch. No need to add an exciter switch and wiring when you use a properly set up 1 wire alternator. Remember, most of those old tractors came stock with a 1 wire generator with the cutout or regulator mounted on the generator and a single wire to the ammeter.
I build my own Delco SI series alternators, I buy them off the "core" pile at the local salvage yard and rebuild them to my needs, large or small output, 1 or 3 wire regulator.
The Delco SI series alternators have to be the most user / rebuilder friendly unit ever made. All you need is a handfull of nut drivers and a self powered test light to test and repair them. No soldering, all parts bolt together. I buy them off the core pile for #5 each and rarely need to put more than another $10-$15 in them to have a fresh purpose built alternator for my latest project. Aftermarket parts for the SI series Delco are very cheap.
Some do not know this, but a 1 wire alternator will work just fine as a 3 wire unit. If you think you need lower excite speed, or have an application that has only a charge light ( IE:New generation JD), just add the excite wiring and you can use it as a 3 wire alternator with no changes.
And last but not least, they do not run down you battery, the parasitic drain is exactly the same as a 3 wire unit, put that old shade tree mechanics tale to rest, and they are every bit as reliable as a 3 wire unit.
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Today's Featured Article - Women and Tractors - More Views From the Farmer's Wife - by Teri Burkholder. The top ten reasons why the judges wouldn't let you participate in the stock antique tractor pull: Hey, this is stock! It came with that V8 in it! That "R" on my tires stands for "really old" not radial! Blue gas? We thought it was a pretty color! What wire hooked to my throttle?
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