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Ballast coil is usually rated at 9 volts whereas non-ballast is 12 volts. Often, there is a label saying “use with ballast”. If no identifying marks, there are two alternatives. Have a multimeter ready, set on DC voltage range, and switch on ignition, but do not start engine. Measure voltage between + terminal (or “sw” terminal, if so marked) on coil to earth. If it’s a ballast type it should read about 9 volts; if not then 12 volts or so. Alternatively, disconnect small wires from coil and measure its resistance across the two small terminals. A 12 volt coil will be about 3 ohms whereas a ballast one will be about 1.5 ohms. (Approx figures, as the test leads themselves will present some resistance depending on length and diameter.) [/quote]
I've performed the first of the tests you've described and I have 12v on the meter, so no ballast resistor.
I spoke to Melvyn to be sure I'm getting the right replacement coil and other bits whilst I'm at it, but for now, the car is running well. Just a bit reluctant to head off on an 800 mile trip without doing the easy things to avoid a repeat of the problem (not that there aren't other things, of course).
