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Tractor Talk Discussion Forum

GM alternator, internal regulator or not?

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Blackstack

12-04-2010 15:10:26
174.253.144.37



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This was supposed to be off a '74 Chev truck which to my understanding is an internal regulator vehicle. It doesn't look like anything I've dealt with in the past as far as being an internal regulator alternator. Can anyone identify it?




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Owen Aaland

12-06-2010 07:06:24
65.165.246.162



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 Re: GM alternator, internal regulator or not? in reply to Bob Lenz, 12-04-2010 15:10:26  
Quoting Removed, click Modern View to see

Actually this alternator can work properly with only two wires. The large output terminal must be connected to battery voltage. The case is grounded and does the same electrically as the ground terminal. The F terminal is connected to one brush and needs to have voltage applied to it from the voltage regulator to control charging rate. The other brush is grounded internally. The other terminal at the plug provides voltage out as means of controlling a light and commonly used to control a relay in the voltage regulator but is not necessary for the alternator to work.

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teddy52food

12-05-2010 20:01:52
68.169.216.43



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 Re: GM alternator, internal regulator or not? in reply to Blackstack, 12-04-2010 15:10:26  
I have a regulator for it if you need one.



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John M

12-05-2010 06:46:44
67.231.169.173



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 Re: GM alternator, internal regulator or not? in reply to Blackstack, 12-04-2010 15:10:26  
Id have to see if I could find the numbers now, but i have this alternator on one of Ms. There is a small box that plugfs into the place where the blue and white wire are, and has a wire goingto each of the two post. (Then the wire goes to the gauge to show the amp output. The guy who set this up for Dad years ago has now passed away, and I dont know the details, I just know it works great, and has been for 15 or more years now. There is also another configuration Dad used on another M, where one of the spaded wires went to a Dodge type cutout, and then to the coil. It worked fine as well.

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old

12-04-2010 17:26:35
4.245.12.174



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 Re: GM alternator, internal regulator or not? in reply to Blackstack, 12-04-2010 15:10:26  
Terminal pharrel (sp) to the shaft is external reg. Terminals point up/ out away from the shaft internal reg. Wasn't tell a bit later that the internal reg type came out. But if you go by what I have said and it is Delco you can spot the internal reg. type a mile away



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Jon Hagen

12-04-2010 19:44:26
69.26.23.96



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 Re: GM alternator, internal regulator or not? in reply to old, 12-04-2010 17:26:35  
One thing that can foul up your day when picking junkyard Delco alternators is a goofy crossbred unit built by Delco in the mid 70's Production of the 10DN alternators had stopped, but for some reason GM still put the external regulators on small cars like the Nova. The alternators on those cars used the same design as the internal regulator SI series, but did not have an internal regulator or diode trio.
They had a goofy brush holder and stator connection that accepted the old square,parallel terminal regulator plug. The Rear alt case had an odd shaped plug hole (kind of like a Chevy bowtie emblem) that would accept either the old square 10DN plug or the long SI plug.

These qdd ball alternators could be converted to an internal SI type by just removing the original setup and replacing it with a stock SI type brush holder, diode trio and internal regulator.

Always pays to look at the regulator plug hole when picking a junkyard Delco SI off the pile.

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billks

12-04-2010 16:27:31
75.221.204.168



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 Re: GM alternator, internal regulator or not? in reply to Blackstack, 12-04-2010 15:10:26  
the terminal labeled grd is the wire that ground the alt to the regualtor. this alt requires 4 wires and not 3.



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Jon Hagen

12-04-2010 16:20:09
69.26.23.96



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 Re: GM alternator, internal regulator or not? in reply to Blackstack, 12-04-2010 15:10:26  
Yep, an old external regulated Delco 10DN.

If the plug is on the rear, and terminals arranged like this {II}, the alternator is externally regulated.

If the plug is on the side of the alternator and the plug terminals are arranged like this { - - }, then it is an internally regulated SI series Delco alternator.



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Bob

12-04-2010 15:54:56
69.178.228.68



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 Re: GM alternator, internal regulator or not? in reply to Blackstack, 12-04-2010 15:10:26  
It's a "10DN" series EXTERNALLY-REGULATED Delco.



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ASEguy

12-04-2010 15:32:34
24.171.3.89



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 Re: GM alternator, internal regulator or not? in reply to Blackstack, 12-04-2010 15:10:26  
Redtom is right. Older GM internal regulator alternators had a "D" slot in the back where you could full field the alternator and determine output. Gerard



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redtom

12-04-2010 15:12:14
97.84.173.0



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 Re: GM alternator, internal regulator or not? in reply to Blackstack, 12-04-2010 15:10:26  
Not internally regualated. Internal ones have the spades the flat way.



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