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Harry Ferguson Tractors Discussion Forum
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Delco 10si Alternator for TO30

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Chris M (TX)

07-18-2006 12:23:38




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I found out that the alternator was unhooked. So I decided to take it to the parts store for a test. It tested generating 8.1 volts. The bearings were very noisy and I could see a dirt dobber nest rattling around in there. So I bought a new one, and he tested the new one, it was fine. On that alt here is the way he said to wire it:

Alt Connections:----- ----- ----- ---
Batt post terminal(on back of the 10si): to ammeter or just straight to battery + (10 guage)

pigtail #1: (is the alt warn light - okay to leave disconnected)

pigtail #2: connect to the batt post terminal on back of the 10si.

The last thing he said was that you need to run a 12v+ wire from the starter switch (on the starter side that gets "monentary juice when starting") to the batt post terminal on back of the 10si. He said that will "excite/activate" the charging on the 10si. He said not to use a 12v+ from the battery to 10si or it can backfeed and drain the battery. He also said that a momentary shot of 12v juice is all that is required to start it charging and then it will stay "locked" in charging mode, until you cut off the tractor.
----- ----- ----- ----- ----- ----- ----- ----
Is my parts guy telling me accurate?

I just wanted to double check with you guys. I am confused about the "excite" connection.

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Chris M (TX)

07-18-2006 13:27:36




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 I redrew my diagram - terminal #1 question in reply to Chris M (TX), 07-18-2006 12:23:38  
third party image

Added a little to my drawing. On the excite wire from #1 on the alt: If it is hooke up without a lamp or diode but it is to a switched 12v source, as in my drawing, then wouldn't the switch being in the off position prevent battery drain?

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Bob

07-18-2006 23:17:38




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 Re: I redrew my diagram - terminal #1 question in reply to Chris M (TX), 07-18-2006 13:27:36  
The Delco 10SI alternators were designed to have an "idiot lamp" or resistance in the lead to the #1 "switched excite" wire, and a diode works, too.

Without one of the 3 devices, once the engine is running, and the alternator begins to charge, when the switch is shut "off", current from the alternator's internal diode trio will "backfeed" out the #1 "switched excite" terminal, and provide current to the ignition coil, preventing the engine from shutting down.

The engine continuing to run when you want it to shut down is obviously undesirable, AND the current backfeeding OUT the #1 "switched excite" MAY damage the alternator's diode trio and/or internal voltage regulator.

Using a 10 Ohm resistor or a #194 lamp will limit the backfed current to a value too small to power the ignition, and the engine will shut down. Using a diode prevents the backfeed of current altogether.

So, make it easy on yourself and the alternator's internals, and use a resistor, a #194 lamp, or a diode, such as a 1N5406 in the circuit to the alternator's #1 "switched excite" terminal.

I see someone has already linked to one of my photos, but I will repeat it in this post.

Third Party Image

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RegoR

07-19-2006 06:16:13




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 Re: I redrew my diagram - terminal #1 question in reply to Bob, 07-18-2006 23:17:38  
Hi Bob,
Thanks for the explanation on the purpose of the diode or lamp.

Chris,
Sorry for the misinformation re: the purpose of the diode or lamp.

Regards,

Roger



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Chris M (TX)

07-18-2006 13:07:09




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 Alt Fan wouldn't fit in reply to Chris M (TX), 07-18-2006 12:23:38  
Another thing. The fan for the alternator wouldn't fit with my wide pulley. But I bet it will get some airflow from the radiator fan anyway.



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Chris M (TX)

07-18-2006 12:46:25




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 Re: Delco 10si Alternator for TO30 in reply to Chris M (TX), 07-18-2006 12:23:38  
Another diagram



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Chris M (TX)

07-18-2006 12:36:34




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 Wiring the 10si on old engine dot org in reply to Chris M (TX), 07-18-2006 12:23:38  
Link



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rklein

07-18-2006 12:40:40




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 Re: Wiring the 10si on old engine dot org in reply to Chris M (TX), 07-18-2006 12:36:34  
Here's a wiring diagram courtesy of Big Dean (I think)



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RegoR

07-18-2006 12:32:06




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 Re: Delco 10si Alternator for TO30 in reply to Chris M (TX), 07-18-2006 12:23:38  
Hi Chris,
Here's last week's post from "Bob" on this forum:



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Chris M (TX)

07-18-2006 12:24:44




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 Re: Delco 10si Alternator for TO30 in reply to Chris M (TX), 07-18-2006 12:23:38  
third party image

diagram.



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old

07-18-2006 13:41:53




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 Re: Delco 10si Alternator for TO30 in reply to Chris M (TX), 07-18-2006 12:24:44  
The picture you have will if wired that way cause you not to be able to shut the engine off because of alternator feed back to the coil. You see once the alternator is excited it holds a charge and that will back feed the coil and when you go to shut it off you will not be able to do so. Thats why you need either a lite bulb or doide in the wire from the #1 terminal to the switch. I use radio shack diode part #276-1661 the line goes to the alternator on the doide. $3 cheap and stops a lot of troubles in the long run. I have wired probably 20 tractors with the delco 10SI alternator useing a diode and all have worked like a charm

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Chris M (TX)

07-18-2006 14:17:03




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 Re: to old in reply to old, 07-18-2006 13:41:53  
Thanks old. I hadn't thought of that. So is the #1 or #2 the wire that "excites"? This is what I can't figure out.



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old

07-18-2006 14:31:17




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 Re: to old in reply to Chris M (TX), 07-18-2006 14:17:03  
The #2 wire is the rugulator wire and it tells the alternato when to switch on and off and thats why it can/is hooked to the big post since the wire from the big post goes to the battery. The #1 wire is the one that excites the alternator and if it isn't excited it will not charge.



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Chris M (TX)

07-18-2006 16:48:40




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 Re: to old (again) in reply to old, 07-18-2006 14:31:17  
third party image

Old, If I put a diode or light bulb in there (as you said), will I have to use a keyed ignition with a "acc" and "ignition" setting or will my old push pull switch work fine?



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old

07-18-2006 20:28:44




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 Re: to old (again) in reply to Chris M (TX), 07-18-2006 16:48:40  
Your old switch will work just fine. The olny reason for the lite bulb or diode is so you can shut the engine off when you want to



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RegoR

07-18-2006 12:35:33




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 Re: Delco 10si Alternator for TO30 in reply to Chris M (TX), 07-18-2006 12:24:44  
I forgot to mention that the diode can be subsituted with a panel lamp, e.g. a red "GEN" dash light. It's purpose is to prevent battery drain after it's shut down.

Roger



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