1970's John Deere 100 wiring
I picked up an old JD 100 mower, loaded it on my trailer after we jumped it. When I got it home I started going over it to see what it needed. When I looked at the wiring between the solenoid and coil I could tell something was goofy. It had a red wire going from the solenoid to coil with a rigged up resistor or diode wired in between. And another wire coming down from the coil, unsure of where it goes...there are no other wires around. So, what is that wire, and is that diode thing necessary? Please help!