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George/Maine · 07-30-2013, 09:44 AM

The only way to tell coil resistance is adding a resister like 1.5 ohms for 12 volt car.
OHMS law 1.5 ohms at 2amp is 3 volts, leaving the coil resistance of ?
12 volt minus 3 volts is 9 volts
9 volt didved by 2 amps is 4.5 ohms. E= IxR
A coil used on big truck, vws, other use no ext resister.
I would think its more then 4 amps for 12 volts.
resisters stay mostly what they are rated +-
coil amps is important high amps burns points.

07-30-2013, 09:44 AM	#35
George/Maine Senior Member Join Date: May 2010 Location: Mid coast Maine Posts: 1,878	Re: Mallory tech answer to coil/ballast ? The only way to tell coil resistance is adding a resister like 1.5 ohms for 12 volt car. OHMS law 1.5 ohms at 2amp is 3 volts, leaving the coil resistance of ? 12 volt minus 3 volts is 9 volts 9 volt didved by 2 amps is 4.5 ohms. E= IxR A coil used on big truck, vws, other use no ext resister. I would think its more then 4 amps for 12 volts. resisters stay mostly what they are rated +- coil amps is important high amps burns points.