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Farmall & IHC Tractors Discussion Forum
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Farmall B alternator and ammeter

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Dave H (MI)

08-01-2007 20:16:05




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I read the info John T posted for me below. If he or anyone else should read this thread I just want to clarify/summarize some of what I understood. Remember guys, I am about as sharp as the business end of a light bulb when it comes to some of this stuff! First, I need to move the ignition switch wire from the starter side of the ammeter to the alternator side. Next, the plug in the alternator has one wire that goes to the stud on the back of the alternator. I stuck my nose in there and the other wire has been cut off at the plug. Looking back at the day I bought this tractor, I can see that I had a couple of fast ones pulled on me. SO, I need to replace that plug with one that has two wires and the missing wire will run to the hot side of my on/off switch. I will need to solder into that wire the mentioned resistor and also the below mentioned diode. Sound about right? I'll look at Radio Shack for the electronic stuff and hit the auto parts store for the wire harness if that sounds right. Then I will see how much damage I can do. I have not verified that it is a GM 10 SI etc etc alternator, but will look for a plate on it in the AM. Pull hard on the reins if I have it wrong! Thanks guys!

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Idaho Ron

08-02-2007 16:31:50




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 Re: Farmall B alternator and ammeter in reply to Dave H (MI), 08-01-2007 20:16:05  
Dave, When I got my Super C it was totally wired wrong. Nothing was even close to right. I used these and everything went fine. I took apart every connection and cleaned them. Man it makes a big difference. Good luck. Ron



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Dave H (MI)

08-02-2007 07:14:31




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 Re: Farmall B alternator and ammeter in reply to Dave H (MI), 08-01-2007 20:16:05  
Thanks for the clarification, Jim, I think I understand now. Appreciate the schematics also, Ron....these are going to have long term benefit as I need to add lights and it just helps to see it in writing. You are right about the guys on this forum but I am OK with them not being any closer. I wouldn't learn as much if they got her going for me and would take a lot of ribbing for my....um.....let's just say I would take a lot of ribbing! :-)

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Janicholson

08-01-2007 20:48:08




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 Re: Farmall B alternator and ammeter in reply to Dave H (MI), 08-01-2007 20:16:05  
No need for a special plug, two regular 1/4" spade connectors that crimp on will be fine, and fit the prongs on the alternator. The wire that is cut off is the one that needs the diode only. The band on the diode is to be closer to the alternator. This diode can be covered with shrink tubing and that will keep it nice. The other end of the diode goes to the ignition switch (as in the diagram below). These alternators sometimes need to be spun to better than 1/2 throttle to get them to start charging. So do not assume it is broken until you rev it up. The resistor can be used in place of the diode, but don't use both. The resistor shown below is for a 12v coil requiring a bellast resistor. Look at the side of the coil to read what may be writ thereon. If it says 12v no external resistor requires, do not put a resistor in that circuit. I hope this helps, JimN

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Idaho Ron

08-01-2007 20:25:51




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 Re: Farmall B alternator and ammeter in reply to Dave H (MI), 08-01-2007 20:16:05  
Here is a couple that might help. I got these from a guy here. I hope they help., Ron

third party image

third party image



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Oewn Aaland

08-02-2007 12:26:16




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 Re: Farmall B alternator and ammeter in reply to Idaho Ron, 08-01-2007 20:25:51  
A burned out warning light bulb in this system will cause the alternater not to start to charge. A small resistor, either in the lamp socket or wired in parallel with the socket, would eliminate this condition. Later tractors have this resistor in the socket which causes the charge warning bulb to glow a little less brightly than the oils pressure warning bulb.



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