Super A 12 volt conversion - Could you check my schematic?

Did I do this right?

12voltconversion_zps67688bfe.png
 
Judging from the wiring between the coil and distributor, you must have a Pertronix (or similar) electronic ignition module in the distributor, rather than a "Internal Ballast". If so, the diagram should work!
 
Yup, other than the "internal ballast" distrbutor, it looks fine to me too.

IFFF you needed a ballast (you don't), it would go in the wire running from the ignition switch to the coil. There is no ballast inside the distributor.
 
I agree: with the diagram except as noted by the Bob and mkirsch. The coil must be a "no ballast resistor required" full 12v design. The 2ga. wire to the starter must go through a switch or relay at the starter.
I put fusable link protection in the charging circuit (either at the alternator, or at the amp meter to battery connection). My reason is that if a diode pack is shorted, or someone jumps it backwards, it fries a 5 dollar fuse link and not the rest of the wiring with possible fire. Jim
 
Its so close and I agree with the other gents great advice, but not to be too over picky lol Id prob use 14 or even 12 gauge stranded wire versus 16 (where you show 16) even if the difference is not hardly measureable and in millivolts, juts how Im wired, I a CONSERVATIVE remember who despises voltage drop even where negligible, especially in the ignition (4 amp) circuit.........

Your un ballasted coil may be labeled "12 volts" or "12 volts NOT for use with ballast" or "12 volts no ballast required" etc but NOT one labeled "12 volts for use with or requires ballast!!!!

As far as the overcurrent protection that Jim and others mentioned, Id probably use 15 to 20 amps (depends on wire size used actually) in the ignition/load circuit (placed at ammeter output) and 60 to 80 (depends on alternators output) in the alternators output circuit. I usually use 10 gauge where you show it in the charging circuit although the alternator (depending on its rating) puts out more then 30 amps. Of course, a wires ampacity is much higher in "free air" then when jacketed or enclosed in counduit......

Nuff said

John T
 

Thank you everybody! Yes, it is a Petronix 12 volt. I also followed ya'll's advice and bought a 20 amp fuse and a 80 amp fuse. Will post an updated schematic tomorrow. After the better part of 2 years I'm almost ready to start the tractor.
 

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