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Farmall & IHC Tractors Discussion Forum
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SMTA won't quit

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Hayfarmer

07-08-2005 07:24:21




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I have a SMTA with 12 volt alternator. I used Bob M's diagram and put a resister in the wire to the switch instead of the light. Worked fine until I put an electronic ignition on the tractor and went to 12 volt coil. Now it doesn't want to shut off, especially when throttled up a bit. I thought it was the switch so changed it but didn't help. I am thinking maybe there is some "leakage" through the resister and with the more efficient ignition it is back feeding enough that it won't shut down. going to try a new resister. Anyone run into this before?

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VOLfarmall

07-08-2005 18:00:57




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 Re: SMTA won't quit in reply to Hayfarmer, 07-08-2005 07:24:21  
Whats wrong with the one wire alt. solves all those problems.



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Bob M

07-08-2005 08:03:58




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 Re: SMTA won't quit in reply to Hayfarmer, 07-08-2005 07:24:21  
The other guys below are on track! Problem is backfeed current thru the resistor after you open the ignition switch is sufficient to fire the (more efficient) electronic ignition.

Easiest solution is to stick a 1N4004 or similar diode in series with the resistor. (Suggest you leave the resistor in place to limit current and save the diode in the unlikely event of a short circuit).

Wire the diode with the banded end is toward the alternator #1 terminal and your problem will be solved!

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farmallhal

07-08-2005 08:02:42




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 Re: SMTA won't quit in reply to Hayfarmer, 07-08-2005 07:24:21  
I converted my H over to 12 volt last fall and I have the same problem using just a resistor. I think a resistor is needed to "load" the alternator into a charging mode at startup. I just throttle my H back to a slow idle and turn off the ignition switch and it shuts down promptly. I guess the resistor and diode in combination would be the correct fix and the load would flow to the alternator through the diode but couldn't backfeed back through the diode to the switch so it could keep running.

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RustyFarmall

07-08-2005 07:29:02




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 Re: SMTA won't quit in reply to Hayfarmer, 07-08-2005 07:24:21  
I'll have to look at the diagrams again to be sure but I think there is supposed to be a diode, not a resistor? The diode is like a one way valve for electricity, lets it flow in one direction but not the opposite.



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ChadS

07-08-2005 07:49:51




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 Re: SMTA won't quit in reply to RustyFarmall, 07-08-2005 07:29:02  
Its backfeeding off the alternator. as Rusty said, diode instead of a resistor, with the resistor, you still have current feeding the ignition, and the alternator is still live, even when the switch is shut off. You could put a switch that comes off the hot wire on the alternator and fix this problem, or put on a diode. Chad



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