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Farmall & IHC Tractors Discussion Forum
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For all you wireing people

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Levi K

04-24-2006 16:46:32




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can you guys help me with the wireing on my 300, which wires go where on the alternator, regulator and starter and light switch.




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P Backus

04-25-2006 08:10:10




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 Re: For all you wireing people in reply to Levi K, 04-24-2006 16:46:32  
It looks to me like you got yourself a handy- dandy new wiring harness, which was meant for the generator/regulator system. It"s not going to work with your alternator- you"ll just have to wire it up using John and Bob"s description and diagrams.
Paul



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John T

04-25-2006 07:11:57




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 Re: For all you wireing people in reply to Levi K, 04-24-2006 16:46:32  
Levi, if thats the GM 10 SI self internally regulated family of 3 wire alternators (what it looks like) DO NOT USE THE OLD VOLTAGE REGULATOR WHATSOEVER. The tractor MUST be used at Negative ground and heres how I describe wiring them. Bobs great diagrams puts it in pictures, which they say is worth a thousand words, so take a look and see for yourself.

Heres how I wire a GM 10SI Alternator and remember, it requires NEGATIVE GROUND !!!!! !

The big rear main alternator output terminal goes to the wire that used to be connected to the BAT terminal on the Voltage Regulator or Cutout Relay. HOWEVER if that wire wasnt already upgraded, when I convert from a Genny to an Alternator, I replace that wire with a 10 Gauge and it runs from the alternators main output up to the LOAD (NOT to battery/starter) side of the ammeter. I also replace/use 10 Gauge from the ammeters other SUPPLY terminal to the battery/starter.

The little side number 2F Voltage Sense Terminal gets connected (use a short 14 jumper wire) right up to to and with the big main output terminal mentioned above.

For the little 1R side Excitation Terminal, run a 16 or so gauge wire from the ignition switches IGN (which is HOT ONLY when ignition is turned on) terminal and in series with it place a 10 ohm 5 watt current limiting protection resistor (dont really need that much wattage power rating, but they are heavy duty built and easy to wire). Then in the rare event the tractor continues to run cuz of alternator backfeed when the ignition is switched OFF, I add in series a 5 amp 50 PIV minimum Diode. The diode must be wired with negative cathode end to the alternator and positive anode end to the switch. Again, the ratings are not that exact but about any diode over a few amps and 50 volts or so works.

Dont forget to change the battery to negative ground and the coil needs to be wired so the negative goes to ground via the distributor points and the positive gets power from the ignition switch and you have to reverse ammeter leads also if your just now changing polarities.

Good luck Ol John T in Indiana

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Bob M

04-24-2006 17:48:11




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 Re: For all you wireing people in reply to Levi K, 04-24-2006 16:46:32  
The diagram at the link below should get you well on the way. The only thing uncertain are the terminal designations on the light switch I see in your photo.

As someone else observe below, with the alternator you have you WON"T need the old voltage regulator - simply remove it!

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Johs in Indiana

04-24-2006 17:32:41




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 Re: For all you wireing people in reply to Levi K, 04-24-2006 16:46:32  
Hi Levi,

I dont know alot about wiring but I can tell you one guy who does. There is a gentleman on this site whose handle is John T. You wmight want to get his email and ask him because he has helped me numerous times on tractors of all different colors. Have fun and good luck.

Josh



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old

04-24-2006 17:03:24




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 Re: For all you wireing people in reply to Levi K, 04-24-2006 16:46:32  
That alternator has a built in regulator so you don't need that little black box regulator. To wire it up you take the big post on the alterntor and wire it to the battery or soliniod hot side either works, the #2 lead from the little plug goes to the big post on the alternator and the #1 lead goes to the switch, the side of the switch that isn't hot till the switch is turned on. You also need a lite bulb or diode in the wire going to the switch. My self I prefer the diodes radio shack part # 276-1661

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Ol Gray A

04-24-2006 16:59:29




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 Re: For all you wireing people in reply to Levi K, 04-24-2006 16:46:32  
I don't know about Farmall wiring yet, but I do know that you will not need the regulator with that alternator that you are using.



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Levi K

04-24-2006 16:50:41




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 Aannd... all the switches in reply to Levi K, 04-24-2006 16:46:32  
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I know their hard to see but who can help.



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Levi K

04-24-2006 16:48:36




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 the regulator in reply to Levi K, 04-24-2006 16:46:32  
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The regulator



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