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6 volt coil running on 12 volts.

J

JDavid

Member
I have run a 6 volt coil after changing to 12 volts for short periods of time but I get a resister on them or change to a 12 coil as soon as I can. What fails in the ignition system if you continue to run that 6 volt coil on 12 volts. I always thought it would burn the points but really don't know.
Thanks,
David B
 
You will burn out the coil,input is like 3v and you are inputting 12v. Be sure to get a coil that does not need a ballast resistor or get one with the new coil.Did you switch the wires on the coil? The ground terminal will go to the distributor on a neg ground 12v system.
 
Yep the coil will fry pretty quickly and kinda hard on the points as well.

Should have good spark as long as the coil and points hold out though.
 
I don't change the ground. I stay with the postive ground as most 6 volts were and leave the coil wire from the plus side going to the points.
 
You can buy a coil with a built in resistor at any auto parts store. They don't cost that much and work really well. Otherwise, yes, you will burn your points and the coil will fail. Don't ask how I know. LOL
Tom
 
When running a 6 volt coil at 12 volts, Ive seen em get so hot you cant keep your hand on them, they will eventually fail. The ignition points are designed to switch not much over 4 or 5 amps but 12 volts on a 6 volt coil could raise that to say 8 amps so they will burn up pretty fast...You can use EITHER a full true 12 volt coil (around 2.5 to 3.5 ohms primary) or a 6 volt coil plus an external series voltage dropping (12 to 6) ballast resistor, your choice but Id opt for the 12 volt coil n be done with it. Youre right, at Pos ground its + goes to distributor...

John T
 
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