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Author Topic: GM 10SI Alternator Wiring  (Read 39053 times)
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ryf
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« on: March 30, 2007, 06:41:46 AM »

the 10si is available at autozone/advance for under $40+core, its in MOST 70's GM cars and the replacements are 60-63 amp, if you pull one in a junkyard from a vehicle without A/C, it COULD be 30amp (assuming its never been replaced-which isn't likely)

The 10SI has three terminals (including those with a 1 wire regulator).

The large "BATT" terminal which gets connected to your battery positive. (Or Terminal Post if your vehicle is so equipped).
And a dual terminal connector. (Repair pig-tails for this connector available at any autoparts store. Or, salvage with alternator if pulling the alternator from a vehicle).
The #1 Terminal. (Marked with a "1" on the case)
This terminal is used to connect to the dash warning light.
For the warning light, a lamp is wired in series with a switched voltage source. During normal operation the lamp stays off. If the regulator is damaged, the #1 terminal provides ground, and the warning lamp will light. Usually.
This terminal is also active on 1 wire regulator equipped 10SI alternators.
The #2 Terminal. (Marked with a "2" on the case)
This terminal is used to excite the 10SI into operation. (3-wire 10SI)
It is connected to the battery positive.
For simplicity you can connect the #2 connector pigtail directly to the "batt" terminal on the alternator.
The terminal is present on 1 wire regulators. Used only for those that require the stock connector to fit snugly.
If you are converting from a 3wire 10SI to a 1 wire regulator you can hook up all your stock connectors, and run it as is. However, thats wasted money unless you plan on cleaning out some wiring under your hood.

If the 1 wire is for cleaning out wires, you only need to retain the "BAT" wire. The #1 & #2 terminal wires can be eliminated. Don't be surprised to find that the #2 wire only goes a short way into the harness and spliced into the "BAT" wire.
The 1 wire regulator comes with a dust plug for the #1 & #2 terminals.


--------------------------------------------------------------------------------

Some other tidbits available from AC Delco for wiring up a 10SI, is wiring package 1870921 (for those 6 to 12volt conversions). This contains the terminal connector AND an extra resistance wire pigtail to connect to the ignition system (don't use a ballast resistor if you use a resistance wire). Also available is an ammeter package (1965400).

Use a voltage guage to monitor your charging system. It will definately give you signs of impending problems. (Bad regulator, failing battery, etc.)

If your looking for a high output unit, keep an eye out for your everyday rebuilt (re-stamped 63amp). In my case, my rebuilt puts out 80amps at high rpm. More than enough for most needs.

High output aside, don't expect your alternator to do anything for you at idle speeds. Alternator output increases with rpm, even a 100amp unit won't put out much more than a 63amp unit at 1000rpm. If your using underdrive pulleys, this may highlight or worsen idle output problems

use your head and ask if you need to.
below are some model numbers, first part # is the AC delco #, second is the lester #. just take both to any parts store and you'll be fine.
10SI
 63amps
 3:00
 321-39
 7127-3
 
10SI
 63amps
 9:00
 321-41
 7127-9
 
10SI
 63amps
 12:00
 321-43
 7127-12
 
10SI
 63amps
 6:00
 321-135
 7127-6
----------------finding one made easy--------------------------
The model 10SI Delco built alternator is the first generation, SI series alternator.  It was introduced on the 1969 Corvette, and by 1973 most GM built cars and light trucks used this model alternator.  It was an option with at least some 70, 71, and 72 GM cars, although it rarely showed up in those years, except for on the Corvette where it was standard equipment.

Assembled with all original GM components, the model 10SI alternator had a maximum output rating of 63amps.  Output rating is determined by the windings in the alternator, and not all model 10SI alternators had the same windings.

There were 10SI alternators with 37amp, 42amp, 55amp, 61amp, and 63amp ratings.  The smaller amp output rated alternators were installed on cars with no air conditioning, and few electrical accessories.  The 61amp output rated 10SI was very commonly installed on 8cylinder cars, with factory air conditioning option. 

For luxury cars loaded with electrical accessories, there were larger and more powerful models of alternators than the 10SI.  A few of the full size Buick, Pontiac, Cadillac, or Oldsmobile could be had with model 15SI, or possibly the model 27SI alternator.  The 15SI and 27SI alternators looked the same, but were scaled up in size.  They were physically larger and heavier, and output ratings were often 70amp, 80amp, and 100amp.


Posted on: March 30, 2007, 06:10:30 AM
multiply the first number by 3, and that is the output of a 10si alternator at a given alternator rpm.
so to make this chart make sense, if you have are idling at 1200 rpm engine, and you have a 4 inch motor side to a 3 inch alternator side.
(engine pulley size / alternator pulley size = ratio)

 so you multiply the idle by 1.33 in this case which is about 1599 rpm divided by 3 is about 533 rpm
( (ratio x idle)/3= chart rpm  )


500 rpm so you'll get 8-10 amps at idle in this case... definitely recharging, and it will be much more if you give it a little gas when your riding. keep in mind with magnetos and no major ongoing draws (except lights, still FAR less than a car) it won't take much

I were you, I'd aim for an 750+ rpm on the chart though so based on a 1200 rpm Idle (don't know what it is for most, my 17hp techumseh is around there according to the stickers and papers... you'd need around 1.875 so around a 5.5-6" motor side pulley should get you 25-30 amps in this case (giving general numbers as it will depend on what size puley you can get.


Delco 10-SI
      37 Amp 61 Amp
500 12        8 
550 15        12
600 17        15
650 19        19
700 21        23
750 22        26
800 23        30
850 24        32
900 25        35
950 26        38
1000 27      40
1250 30      48
1500 33      52
1750 34      55
2000 35      57
2250 36      59
2500 36      60
2750 37      61
3000 37      62
3250 37      62
3500 37 63
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« Reply #1 on: March 30, 2007, 08:26:49 AM »

My god that's allot of info.

That would be more than enough to run a winch, EXCESSIVE lighting, and anything else you could mount on there.
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« Reply #2 on: March 30, 2007, 09:59:02 AM »

as a side note, its not 3 to 1 for the 10si spindle RPMS, they are any where from 2.3 to 2.8 in case someone wants to get literal, so don't get too hung up on finding the perfect pulley's, I left enough room in the math to make it simple and less likely for you to come short even if your alternator isn't exactly the same as the numbers...

I WOULD use 3 to 1 for all calculations though, since you will always come out pleasantly suprised that way, but if you can only get a 3.5" driver pulley, you'll probably get 10-15 amps at idle anyway... so don't stress if its all you can find locally (using the actual divider) if fact I might RECOMMEND a smaller pulley if you are not upgrading to a bigger battery. that way you aren't as likely to boil out that small lawn mower battery (like 200ish cca)
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« Reply #3 on: April 03, 2007, 07:17:18 PM »

thats some great info now to ease my curiosity do you have any install pics and do you know how much h.p. it will rob
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« Reply #4 on: April 04, 2007, 02:23:06 AM »

your the lucky winner of my last post for the week.

they say it can take as much as 2 hp to keep it going assuming the 2.3-2.8 ratio, in high amp draw. now, since we draw so little, it will be less, except when your winching. we really shouldn't have it be nearly as bad as a car with all the gismos, plus lower rpms will require less power. if you put a switch on the field wire it would be none when its off.

I haven't installed one on my mower.. my ATGC I'm working on is getting one. when I get back I might get to work installing it... its not on the first thing list though. the general idea is put it on the mower deck driver pulley. and mount it somewhere you can live with it... this probably won't be the first thing people do.. chris tracked down a 15 amp stator for his ride. I would say that would be enough for most of you... because most 4 wheelers are running about there. this was brought up on heymow a while back and I had been working on it for myself... they got into the "racing only" upset and I just figured I'd hold it until ATLMA had a home.

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« Reply #5 on: April 12, 2007, 07:16:53 PM »

I cant wait to see this setup once its finished.
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« Reply #6 on: February 27, 2008, 08:58:57 PM »

So has anyone hooked this setup up yet. I would love to see pics.
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« Reply #7 on: February 28, 2008, 05:03:29 AM »

ryf has one on his ATGC. Maybe we can bribe him into some good pics of the setup.

-Phil
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« Reply #8 on: February 28, 2008, 05:59:10 AM »

well, the alternators just run on a second motor side pulley. very simple, i can get some pics on saturday/sunday when I go back over to work on it (I do the work in my father in laws shop) it works really well. you definitely want to underdrive it if you are using a mower battery, probably under 50 amps with the high grade mower battery.

****photos****

there were some in my build thread..



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« Reply #9 on: February 28, 2008, 06:47:51 AM »

Your right tire is on backwards wink
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