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Farmall & IHC Tractors Discussion Forum
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Super M Electrical Problem

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TV Iron

03-10-2008 14:04:13




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I converted my SM to a 12 volt system using a delco 10SI alternator. When the switch is pulled on, the tractor will fire right up---amp meter reads correctly. However, when I push the button in to stop the tractor, the tractor continues to run. I followed a diagram for the SM shown on this forum, but I am puzzled on how to stop the tractor. What am I doing wrong?




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John T

03-10-2008 17:23:16




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 Re: Super M Electrical Problem in reply to TV Iron, 03-10-2008 14:04:13  
TV, I recommend use of a 10 ohm safety current limiting resistor (or else an idiot light) in the alternators No 1 terminal Excitation circuit to prevent that run on (alternator is backfeeding coil) even though shes shut off, thats the circuit from the ignition switches IGN output or down on the input (NOT to distributor) side of the coil to the Lil No 1 terminal on the alternator. Others use a diode in that circuit (and theres nothing wrong with using a diode there) but it MUST be wired neg cathode side towards alternator.

John T

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Janicholson

03-10-2008 17:21:07




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 Re: Super M Electrical Problem in reply to TV Iron, 03-10-2008 14:04:13  
On page 2 there is a post called 12 volt alternator. in it BOB placed a photo/diagram of exactly what you need. JimN



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Tom 43

03-10-2008 14:45:21




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 Re: Super M Electrical Problem in reply to TV Iron, 03-10-2008 14:04:13  
The 10 Si Alternator has an internal solid state regulator so there are no contacts of any kind. You need to have a light, resistor or diode between the switch and the 1 terminal of the alternator to prevent the 1 terminal from feeding the coil when the switch is turned off.



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Allan In NE

03-10-2008 14:39:25




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 Re: Super M Electrical Problem in reply to TV Iron, 03-10-2008 14:04:13  
That alternator is backfeeding the coil.

Think most of these guys that convert 'em put a diode or idiot light in the ignition primary circuit.

Allan



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james rumph

03-10-2008 14:26:38




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 Re: Super M Electrical Problem in reply to TV Iron, 03-10-2008 14:04:13  
I'll bet by lowering the rpm it shuts off ! There is a set of contacts in the voltage regulator that are to wide .

I had the same problem and that is all it is. I don't remember the gap tollerance but it is a simple fix .

With the cover off pull the switch on and you will see the contacts open. Start the tractor then turn it off they should close unless there set wrong , they are .[ to wide ]

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