Would really be great to get some responses..

I'm not sure if my generator is working. It is the style with 3 wires going to it. How do I test that it works? I held my voltmeter with one lead on the positive ground of the battery and the other lead on each of the 3 posts on the generator and didn't see a voltage. Should I have? Is it shot? Is there a way to fix it?

 

I've read that checking the output voltage on the generator is the only real test you can do of the generator with it in the tractor... otherwise you need a bunch of special bench test hardware. At least, that's what they write about for the 12 volt negative ground Delco-Remy's in the RF JDs. They make around 13.6 volts when charging


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Here is an old document I had for the N charging system and also look here for more info: http://www.mytractorforum.com/38-fo...om/38-ford-ns-9n-2n-8n/536825-6-volt-charging-ciruits.html?highlight=charging+b

 

First things first, you need to determine if the generator is working.
1: connect a volt meter with clips so u don't have to hold the leads,
2: take note of voltage reading with engine not running,
3: start engine, set rpm to around 15-1800,
4: then use a jumper wire to ground the field terminal,
this bypassed the regulator, the voltage reading now should be more
than what was observed in step #2. If is it not 1-2 volt more, then
the generator is not working.
When you determine the generator is working, then it's time to troubleshoot
the regulator,

Hope this helps,

Jimmy

 

Which terminals should I connect the clips to on the generator? It's been painted over 50 times and I can't read any labels on the terminals. I can just see the faint color of the wires connected to those terminals, and I don't even know if I should trust those color codes of the wires. So I don't know which should be the field terminal. But you're saying I have to hold one clip on one terminal, and the other on the field terminal, which should also be grounded out?

 

Use a jumper wire to connect the field terminal to ground, I have
no idea how to tell you which is ground, you may have to scrape
off enough paint from the gen case, also the connection tabs on the
regulator may be marked. that's about the best I can do without
being able to lay my hands on it. Maybe someone could post a pic
of the reg. or gen, with the terminals labeled.

Jimmy

 

1. First, polarize it by jumpering BAT to ARM, then restart.

2. Full field gen by grounding FLD tab at gen while at mid throttle. Any charging? If not, jumper BAT to ARM. Anything?

3. If no, disconnect wires from gen and do a motor test. Remove belt, connect BAT to ARM, and ground the FLD terminal. Gen should spin if it is good.

Note: The full field test makes the gen charge at max so do not leave jumpered too long.