Ignition and wiring questions

John 37A

Member
I am working on a 52 A and am down to spark and wiring. The tractor has been converted to 12 volt, but how can I tell if it is positive ground or negative? I hooked it up with + ground and it spun the engine over, but I had no spark.

I would like to switch to electronic ignition, and if I do, assuming it is + ground, what all is effected? Ammeter wires need switched and generator needs polarity switched? Anything else?

Thanks,
John
 
Does it have a alternator? Most are negative ground. Check the wire from the coil to the distributor. It should be the same as the ground on the tractor.
 

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