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Which alternator to use on a TEA-20?

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Dusty Dave

04-27-2000 19:55:40

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Hi, folks. I've got a TEA-20 with the Standard motor. But some idiot had done a 12-volt conversion on it which included adding a Delco 10si alternator, which is commonly found on Chevy motors. Too bad he never connected all the wires! No wonder it didn't work. I put in a charge light and hooked it up so that it would excite the charging circuit--- the way it's supposed to be set up--- and it works now.

Except..... you have to rev the guts out of the old motor to get the alternator to start charging. This is because these Delcos are designed to be spun quickly to start charging. The problem is that the crank pulley on the Ferguson is too small, and a lot smaller than the pulley on a Chevy motor. This has affected the crank pulley/alternator pulley gearing so that the damned alternator won't charge at idle. The Delco pulley is also a lot narrower than the Ferguson pulleys so the belt doesn't sit right.

So, what do the rest of you guys out there do to charge your batteries? Is there a popular alternator conversion that will work better than this? Help! I have to rev the motor so hard just to start the Delco charging that I'm expecting to throw a rod soon! Thanks for anything you can tell me.

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Gregg

04-28-2000 19:42:43

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Re: Which alternator to use on a TEA-20? in reply to Dusty Dave, 04-27-2000 19:55:40

Hi Dusty, It sounds like your delco has the "one wire regulator" in it, with this regulator you only need to hook up the battery wire on the rear of housing, it does not need the two spade terminals on the side hooked up even though they are there, this type of regulator needs to be spun up fairly fast before it will start to charge, after it starts to charge it will continue to charge at low rpms, there is 2 different ones of these regulators the good one does not need real high rpms to energize system and a good electrical shop can get you the correct one, but because you went to the work to hook up a light you should be able to just get a replacement regulator (non self energizining) and install it and it should charge at very low rpms, i can provide #'s if you need, good luck!

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Dusty Dave

05-01-2000 07:14:34

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Re: Re: Which alternator to use on a TEA-20? in reply to Gregg, 04-28-2000 19:42:43

Thank you. I really would appreciate the part numbers. It also turned out the belt on the tractor was too small, and wore a hole in the waterpump pulley! I got the proper belt and it sits higher in the tractor pulleys. Now I'm cutting a spare alternator pulley in half. I'm going to put it back on with a spacer so the belt will sit closer to the shaft. But after all that, the right regulator would be great, too. Thanks again.

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Gregg

05-03-2000 16:33:02

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Re: Re: Re: Which alternator to use on a TEA-20? in reply to Dusty Dave, 05-01-2000 07:14:34

the number for the non-self energizing regulator is standard, blue streak #vr-111, you will need all 3 wires hooked up for this one to work.

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Dusty Dave

05-03-2000 18:55:05

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Re: Re: Re: Re: Which alternator to use on a TEA-20? in reply to Gregg, 05-03-2000 16:33:02

Thanks a lot, Gregg, that's a great help.

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Daniel

04-28-2000 08:43:51

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Re: Which alternator to use on a TEA-20? in reply to Dusty Dave, 04-27-2000 19:55:40

I had a similar problem on a Farmall, I went to a junk yard that has a lot of 60's, and 70's stuff and found a pulley that was smaller than the one already on my alt. The belt fit better too. I have the 10Si alternator and it charges at about 600 RPMs on the Farmall.

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