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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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