Stalling Farmall Super C

[used red MN]

It all depends if your M is still original 6 volt and positive ground the coil should be wired with the positive primary ..small terminal.. connected to the wire to the distributor. Same applies to the Super C. If a machine has been converted to 12 volts and usually an alternator installed they are usually converted to negative ground so the coil polarity is reversed and the negative terminal of the coil connects to the distributor.
It is my understanding that a reverse polarity or incorrect connection to the coil has no harmful affects on the coil and the machine will run fine. The improper connection only makes the coil work less efficiently. All that said it seems that the coil that was on the Super C must be failing. The only way to double check would be to put it back on and see if the problem comes back.

 

[rustred]

On positive ground units the pos. Side of the coil goes to
the distributor. The other way around for neg. Ground
units. And yes if the coil was that hot it is done. It will be
cool or slightly warm according to the outside temp. So
make sure it is hooked correctly according to the battery
ground. They can or will run opposite, but the spark is
weaker and can be hard to start.

 

[farmallphred]

Both tractors 6 volt positive ground. There seems to be two varieties of coils, one with plastic casing, one with metal. Plastic casing variety around $25, metal casing $60. I've gone through 2 of the metal casing variety, both failed in short order. I've not tried the plastic casing variety, assumed cheap was cheap, but maybe not so? Does anyone have a source for a reliable coil?