JD 620 wiring

Farmer MM

Member
I have the shop-manual, but the printing is so small/mixed. Anybody have an EASY console wiring diagram? My question is where does the green coil wire attach? Tractor has an external resistor.
 
What is your service manual? Genuine JD or after market? There is a JD service manual titled
Electrical Systems SM-2029 that will probably help you. It can be downloaded.
 
Green wire off the coil goes to the resistor. Input side of resistor should have a wire coming
off the starter motor. This way the points have 12 volts when the start is engauged.
 
Wiring on mine: Red wire from coil goes to upper side of resistor. Bottom of resistor smaller blackish wire goes to center terminal dashboard switch. Heavy blue wire from coil (same side as red wire) goes to center/top side of dashboard switch. A heavy blue wire comes up from center of transmission area, through mounting (dashboard) frame, and connects to SAME switch terminal as coil blue wire. Make sense?
 

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