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Old 04-12-2017, 09:45 PM   #1
Gold Digger
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Default 12 volt coil on 6 volts

I purchased another "A" sometime back and just noticed that it has a coil that says Motorcraft on it that looks like one on a modern day 12 volt car. The car runs like a top and have drove it on several tours racking up 3500 miles so for with out any trouble. Should I change this out or if it's not broke don't fix it?
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Old 04-12-2017, 09:52 PM   #2
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Default Re: 12 volt coil on 6 volts

I also run a 12 volt coil (no internal resister ) in my 30 coupe , starts and runs like a top.
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Old 04-13-2017, 08:02 AM   #3
Mike V. Florida
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Default Re: 12 volt coil on 6 volts

All coils start out as 6 volt coils. The manufacturer adds an internal resistor on some to drop the voltage from 12 to 6 volts. Others need an external resistor to drop the voltage from 12 to 6 volts.

Your must be the one that would have needed an external resistor if it was used in a 12 volt vehicle.
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Old 04-13-2017, 08:15 AM   #4
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Default Re: 12 volt coil on 6 volts

Quote:
Originally Posted by Gold Digger View Post
I purchased another "A" sometime back and just noticed that it has a coil that says Motorcraft on it that looks like one on a modern day 12 volt car. The car runs like a top and have drove it on several tours racking up 3500 miles so for with out any trouble. Should I change this out or if it's not broke don't fix it?
If it ain't broke doodle with it until it's broke:-) Just continue driving and have fun !
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Old 04-13-2017, 09:37 AM   #5
katy
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Default Re: 12 volt coil on 6 volts

Quote:
it's not broke don't fix it?
You answered your own question.
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Old 04-13-2017, 12:22 PM   #6
Patrick L.
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Default Re: 12 volt coil on 6 volts

Keep on fixin it till it breaks.


You could measure the voltage at your points, shouldn't be over 8v. Most Fords do not use a resistor coil. They tend to use an external resistor or resistor wire. Or measure the resistance in the coil, should be about 1.5 ohms. A 3 ohm coil has a resistor.
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Old 04-15-2017, 07:50 PM   #7
Ronald
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Default Re: 12 volt coil on 6 volts

I use a 6 volt battery and a 12 volt coil no issues. 6 volt coils are twice the money and more in my part of the world. I believe that coils do not know the difference ?
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Old 04-16-2017, 10:43 AM   #8
Gold Digger
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Default Re: 12 volt coil on 6 volts

Thanks Guy for the info. I'll probably just leave it alone till it quits or keeps on running.
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Old 04-16-2017, 10:47 AM   #9
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Default Re: 12 volt coil on 6 volts

One has to verify the primary resistance of the coil, a 6 volt coil should have approximately 1.5 to 2 ohms resistance.
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