Ignore any references to internal ballast, it just serves to confuse. A
coil is either a 12v coil or a 6v. Whether it has an internal ballast or
not is completely immaterial. A chrome bumper car had a 12v coil from the
factory, a rubber bumper had a 6v coil with an *external* ballast. As a
check, the 12v coil has a primary resistance of about 3 ohms, a 6v about 1.5
ohms. The external ballast has a resistance of about 1.5 to 2 ohms.
A 12v coil is right for your car, regardless of what is inside the can.
----- Original Message -----
From: "Patton Dickson" <firstname.lastname@example.org>
Sent: Sunday, March 17, 2002 11:55 PM
Subject: Internal Ballast Resistor coil?
> I ran by the local auto counter today to grab tune up stuff so I can work
> in the ignition over the next couple of nights. I updated to the push in
> distributor cap and modern silicon wires, but I forgot I would need to
> change the coil when I did this as my coil is the screw in type.
> The coil they recommend was a 12 volt internal ballast resistor coil, is
> this right for a 67 MGB converted to negative ground? I know the car
> doesn't have an external ballast resistor, but I can't remember if I need
> ballast resistor at all.
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