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m wont shut off unless idling?

H

henry rit

New User
I have a 46 m that was converted to 12 volt when I bought it with a toggle switch on/off and a push button to start it. The problem is it wont shut off unless its right down on idle any suggestions on what it could be?
 
I think you need a diode between the alternator and the battery. I am not real sure so I will watch and see what the real experts think.
 
If you have an alternator, you do need a diode between alternator and battery, there is a great wiring diagram in archives done by Bob M for 12 volt conversion using alternator. without the diode it will back feed and stay running
 
Assuming it is a 10SI alternator or Hitachi, Wired as a three wire setup, not a one wire setup.
A 10 ohm resitor, a side marker light bulb, or a 3amp diode with the band end toward the alternator will fix it. It is in series with the wire going to the #1 small terminal on the alternator, connected to the ignition switch, or coil wire going to the ignition switch (possibly hooked to a ballast resistor at the coil). Jim
 
it is a three wire, a buddy of mine told me his grandfather always puts a light on his tractors when he converts them to 12 volt, so that's probally why.also I don't have a resistor on the coil it is 12v but should I? thanks
 
I think this diagram compliments of Farmall Bob will help you. You need the light or diode in the drawing.

05-12vAlternatorConv-rev4_22_08.gif
 
The diode goes into the wire before the "1" terminal on the alternator, with the line on the diode towards the alternator.
 
There are a lot of electrical solutions to your problem but you really should let it idle for awhile before you shut it off anyhow, depending on how hard you were working it.
 
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