Won't start after 12v conversion - We won !

With no resistors in line, what is the voltage at the top of the coil with the points closed? If it is much above 11 volts, you will burn the 12 volt coil out eventually. Your alternator will put out about 14.7 volts which will let the smoke out of the coil at the worst possible time. You can run it this way, but keep a spare handy!

Good luck,
Danny

If you use a 6 volt front coil, you need BOTH the original ballast resistor and another resistor to get the voltage to about 3.5 volts with the points closed.

If you use a 12 volt coil, you should be able to use only the original ballast resistor. Again, check the voltage at the coil. About 10 volts.

Danny

That is a "running" number, if you think DC is confusing, your ignition actually operates per AC laws & induction factors. The "Static" DC measurements provide "some" indication of how the system should perform when running.

What we want to Know is the "MAX" Current when Static. Measure the Voltage again! ALWAYS with the points closed, and put your ammeter in the LINE.
It would Help to Measure that Coil's resistance.

ALL the front mount coils need "Some" resistance. You may have a BAD ignition switch or wire connection that is "Masking" an over current condition, but those things only get worse until you have to replace them. Better you do it now or you will pay later.

Get it Right,

Nuttin high tech about this reply from Phil even tho it wuz not directed to you its all the info needed to git a 12V front mt coil werk'in and live a long healthy life.

• Right coil voltage/amps

You don't need to put an ammeter in line. Your dashboard ammeter will tell you almost anything you could need to know about a Kettering ignition system.

All without touching a wrench and delivered automatically every time you throw the switch!

That's right, you can't afford NOT to have a dashboard ammeter!