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Which 12 Volt Alternator?

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Tweeter

11-21-2005 18:59:03

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I want to change the alternator on my 330U from a MOPAR with external regulator to a DELCO single post with an internal regulator. Can I use any alternator or is there a specific one that I have to use?

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doc_foley

11-22-2005 09:22:38

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Re: Which 12 Volt Alternator? in reply to Tweeter, 11-21-2005 18:59:03

One wire alternator setups DO drain the battery when not running. For tractors that don't get run much this causes a problem. I just aquired an H with a one wire alternator that did just that. Plus, the alternator was connected directly to the battery so wouldn't see the drain through the ammeter. I wanted to keep the alternator as it is so I wire a simple Bosch relay to connect/ disconnect the alt. from the system. The relays are rated for 30amps but go to 40. I have not seen anything close to that even on start up. I have to rewire my 300U and Super C now.

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Wayne Swenson

11-22-2005 12:23:53

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Re: Which 12 Volt Alternator? in reply to doc_foley, 11-22-2005 09:22:38

Don"t get in the habit of "painting all 1 wire systems with the same brush".
My son has a 1943 M with the one wire system and for the last 11 years it has not caused any voltage leakage.
While teaching Vocational Automechanics for 33 years, I have had many opportunities to diagnose & repair 10-SI systems and the usual voltage loss problem is a leaking diode internally. These units are not exactly new so a used or rebuilt one might have a problem.
Take it apart & use your trusty ohmmeter to check out the system. It is rather simple and you can learn a lot. Don"t forget to remove the toothpick holding the brushes in place when finished assembling or there will never be any charging "going on".
The 1 wire system is so easy to install and you do not need any extra wires or lights.

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El Toro

11-22-2005 06:28:11

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Re: Which 12 Volt Alternator? in reply to Tweeter, 11-21-2005 18:59:03

Some on this forum have used the Hitachi alternator p/n 14231. NAPA's number is 2138130
cost about $50.00. Hal

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Bus Driver

11-22-2005 16:23:05

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Re: Which 12 Volt Alternator? in reply to El Toro, 11-22-2005 06:28:11

All the parts stores in my area charge quite a bit more for that Hitachi alternator. Without trade-in core, the cost here is closer to $100. I bought two at a wrecking yard and both had already been rebuilt before the vehicles were junked. So I suspect that they are not as durable as the Delco. But the Hitachi has the benefit of smaller size.

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Dave in CT

11-22-2005 05:29:38

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Re: Which 12 Volt Alternator? in reply to Tweeter, 11-21-2005 18:59:03

I don't know about the 330U but under the H's hood the 10SI is a pretty tight fit. You may want to search the archives - some folks have mentioned other equivalent alternators that are smaller and fit nicely. I'd go with the 3-wire setup. Bob M has diagrams for the wiring and here's a link to give you some more info on the 10SI and 1 and 3 wire setups.

Link

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Bus Driver

11-22-2005 04:47:31

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Re: Which 12 Volt Alternator? in reply to Tweeter, 11-21-2005 18:59:03

The Delco 10si used on regular vehicles is at least 37 amps and often goes up to 63 or so. A 37 will be more than adequate for your tractor. The rating will be stamped on the alternator. If space is tight, do not use one from a Chevelle. The base mounting holes on it are farther from the body than on the typical 10si.

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Hobo,NC

11-22-2005 05:39:00

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Re: Which 12 Volt Alternator? in reply to Bus Driver, 11-22-2005 04:47:31

did you mean chevett cuzz I know thet are that way and sum times like to use'em to git the throw on the adjustment set up different.

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Bus Driver

11-22-2005 10:01:07

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Re: Which 12 Volt Alternator? in reply to Hobo,NC, 11-22-2005 05:39:00

You are absolutely correct. The CHEVETTE has the long mounting frames.

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old

11-21-2005 19:16:16

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Re: Which 12 Volt Alternator? in reply to Tweeter, 11-21-2005 18:59:03

Are you talking about what they call a one wire or are you talking about the 3 wire type?? The 3 wire works better and is less trouble then the 1 wire type. I think there a delco si10 but not sure I just ask for one that was made for a 1980 chev pickup with out any of the power stuff like AC or windows.

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Tweeter

11-21-2005 20:03:17

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Re: Which 12 Volt Alternator? in reply to old, 11-21-2005 19:16:16

I am talking about the one that has a BAT post and two posts (I think s1,s2). Then Im hoping that I can 'excite' the alternator with small wire from one of the 's' posts to the BAT post using a diode.

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old

11-21-2005 20:34:44

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Re: Which 12 Volt Alternator? in reply to Tweeter, 11-21-2005 20:03:17

Then your talking about the 10SI the way that is wired is you have the #1 termanal going to the switch with a diode in that wire. The #2 goes to the big post of the alternator and the wire from the big post goes to the battery or amp gauge. Simple

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Tweeter

11-21-2005 20:39:44

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Re: Which 12 Volt Alternator? in reply to old, 11-21-2005 20:34:44

How many amperes do I want?

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old

11-21-2005 20:49:20

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Re: Which 12 Volt Alternator? in reply to Tweeter, 11-21-2005 20:39:44

You don't need a very big one, I use the smallest one they have. The most you might run is lights, and you figure what all is on a car and then you understand why the lowest amp alternator is more then enough.

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John T

11-21-2005 19:15:25

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Re: Which 12 Volt Alternator? in reply to Tweeter, 11-21-2005 18:59:03

Tweeter, myself and a lot of people use the GM 10 SI 12 volt Negative Ground Alternator as they are so cheap n readily available, however, they are a 3 wire internally regulated but its so easy to excite them n make em function as a one wire they are often used. They make true One Wire alternators which are easier to wire, just take the output n get it to the battery often via the ammeters load terminal, but they dont kick in until a tad higher RPM and may cause a very slight battery drain when setting I believe.

John T

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