Starter generator

[gwoomay]

Good morning group. Am looking for a little help with a Delco Remy starter generator. I found this particular one in an old out building(nice & dry inside).
I have built a test stand using a 120vac/1725rpm motor with a belt drive to a Cub Cadet starter generator mount, also volt meter and ammeter. When I tested this starter generator on Saturday I ran it at 1725rpm(1:1) with motor(using 3" pullies on both). No voltage output from the starter generator. I have the capability using 7" motor pulley and 2 1/2" starter generator pulley to turn the starter generator at 4830rpm. Now, since I have no idea how long this starter generator sat is it possible it needs to be polarized/excited? I checked brushes, springs etc before testing and tings seem to be ok. If polarizing/exciting is warranted how do I go about it? I have excited straight generators(no start function) by putting 12vdc to field terminal but these Delco Remy starter generators have a field terminal and an armature? terminal is well and I don't want to fry anything. Once I get my test sand painted I will try to post a picture. Thanks in advance for comments, answers, teachable moments. Doug May 73, 122, 129

[olds45512]

That's not how I check them. If you have a 12v battery and some jumper cables all you need to do is clamp the ground to the body and the positive to the armature which will get the unit spinning, you then take a piece of wire and touch it to the body and the field terminal and if the unit slows down then its good. Like I said just touch it for a few seconds and it should instantly start to slow down, Do not perform this test for long as it can cause damge

[Alvy]

Here is a link to help

http://www.onlycubcadets.net/forum/showthread.php?t=18

[mmzullo]

Easiest way I test a s/g is get a battery and jumper cables. Neg to body ground of sg. Pos to A terminal should run or make it spin the sg then put pos on F terminal and it should stop the sg almost immediately. It won't give you a reading but it will tell you the armature and wiring is ok. But if you use the method you have you put a volt meter on the A terminal and pos from a battery to F terminal and spin it it should have 16 or higher voltage. Make sure you have a good ground on all the tests above.
This should work.

Ok I type too slow.

[Alvy]

Tim beat me to it, also would like to add that F to A terminal on S/G quick resistance test should yield approximately 8 ohms resistance. Also make sure you have a CCW rotation on it

[gwoomay]

Sooooo. All my brainstorming, etc was for naught. Sounds like I tried to over complicate things. Thanks so much for the help. When it warms up again I will try these things.

[Yosemite Sam]

Originally Posted by gwoomay

Sooooo. All my brainstorming, etc was for naught. Sounds like I tried to over complicate things. Thanks so much for the help. When it warms up again I will try these things.

The guys are exactly right about checking a S/G for output. However, the test stand that you have built may not be as useless as you think.

If you follow the wiring diagrams in the tech section, add the correct wiring and incorporate a questionable 12 volt battery, you can use your test stand to check/adjust old voltage regulators.

It is said that a starter generator polarizes itself each and every time the key is turned to the start position (there are those who will argue the point).

To polarize the S/G. With ALL the wires, the S/G and the V/R connected AS THEY SHOULD BE, briefly connect the generator armature to the battery hot terminal. In most cases the easiest way to do this is, using a short jumper wire, touch one end to the Batt and the other end to the Gen terminals on your V/R. As soon as contact has been made you should see a spark and the process is finished.

[ford4150]

"Once I get my test sand painted I will try to post a picture."

I'm interested. I have a 1750 motor doing nothing, a spare S/G mount, and a couple gauges.
it would be a nice set-up for adjusting a VR, as Sam mentioned.

[Mike McKown]

Some of those S/G units were reverse rotation. Check it out.

[gwoomay]

If you have one with reverse rotation just reverse leads on your 120vac motor to change its rotation direction. That's what I did with mine after checking the direction that it was rotating before trying to test your starter generator or voltage regulator.