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4020 melts coil

A

Anonymous-0

Well-known Member
67 gas 4020 is melting coils after 30 minutes of use. 12 volt coil
positive ground. starts good runs good. then shuts down. never
gets overheated. is it supposed to be 6 volt negative ground. i
didnt do the work.. bought it with 12 volt battery and 12 volt coil.
 
12 volt pos grd. system.
You must have the wrong coils or missing a resistor or resistance wire built into the harness. Not sure right now what that model uses to cut the voltage back. But that is what is melting yours.
 
On a 12 volt tractor a 12 volt coil should NOT overheat and fry.

A 12 volt coil may be labeled "12 volts" or "12 volts no Ballast required" or "12 volts not for use with ballast resistor"

A coil labeled "12 volts for use with ballast resistor" or "12 volt ballast required" etc IS IN REALITY A 6 VOLT COIL AND NEEDS THE BALLAST JUST AS IT SAYS OR IT WILL OVERHEAT

A 12 volt coil will have a LV Primary resistance between little + and - terminals in the range of 2.5 to 4 ohms. A 6 volt coil will be more like 1.25 to 2 ohms

Far as I know as long as Deere still used generators they were still POS Ground and the coil should be wired accordingly

John T
 
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