That starter switch with the extra little terminal to send unballasted battery voltage to the coil ONLY WHILE CRANKING (ballast by pass system to improve cold weather starting) is a simple and easy fix if its not already so equipped. The wire goes from there to the coils high INPUT (from ballast and NOT to distributor) terminal.
CAUTION NOTE (a lot of laymen and rookies MISS this safety feature) on the 20 series tractors that used the ballast by pass system the ignition switch has an extra terminal Mag/Ground and it wires down to the coils low output (to distributor) terminal for safety BECAUSE without it when you step on the starter even if Ign is off, the engine ignition is HOTTTTTTTTTTT
Thats why on the 20 series theres 4 wires on the coil, 2 on input (from ballast and to startrer switch), 2 on output (1 to distributor one to ign switch Mag/Ground)
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