The Ford Barn

Gold Digger · 04-12-2017, 09:45 PM

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?

Ronald · 04-12-2017, 09:52 PM

I also run a 12 volt coil (no internal resister ) in my 30 coupe , starts and runs like a top.

Mike V. Florida · 04-13-2017, 08:02 AM

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.

Big hammer · 04-13-2017, 08:15 AM

Quote:

Originally Posted by Gold Digger

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 !

katy · 04-13-2017, 09:37 AM

Quote:

it's not broke don't fix it?

You answered your own question.

Patrick L. · 04-13-2017, 12:22 PM

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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.

Ronald · 04-15-2017, 07:50 PM

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 ?

Gold Digger · 04-16-2017, 10:43 AM

Thanks Guy for the info. I'll probably just leave it alone till it quits or keeps on running.

katy · 04-16-2017, 10:47 AM

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

04-12-2017, 09:45 PM	#1
Gold Digger Senior Member Join Date: Nov 2011 Location: Arkansas & Alaska Posts: 645	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?

04-12-2017, 09:52 PM	#2
Ronald Junior Member Join Date: Oct 2014 Location: Collingwood,Ontario,Canada Posts: 27	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.

04-13-2017, 08:02 AM	#3
Mike V. Florida Senior Member Join Date: May 2010 Location: South Florida Posts: 14,054	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. __________________ What's right about America is that although we have a mess of problems, we have great capacity - intellect and resources - to do some thing about them. - Henry Ford II

04-13-2017, 12:22 PM	#6
Patrick L. Senior Member Join Date: May 2010 Location: Largo Florida Posts: 7,225	Re: 12 volt coil on 6 volts Sponsored Links (Register now to hide all advertisements) 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.

04-15-2017, 07:50 PM	#7
Ronald Junior Member Join Date: Oct 2014 Location: Collingwood,Ontario,Canada Posts: 27	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 ?

04-16-2017, 10:43 AM	#8
Gold Digger Senior Member Join Date: Nov 2011 Location: Arkansas & Alaska Posts: 645	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.

04-16-2017, 10:47 AM	#9
katy Senior Member Join Date: Jun 2015 Location: Red Deer, Alberta Posts: 5,046	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. __________________ If you don't hear a rumor by 10 AM, start one!. Got my education out behind the barn!