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I've had coils fail completely (no spark) but I can't recall one working with a weak spark. I'm sure it's possible, but not sure how likely. I'd be more likely to say it's the wires or plugs, but you can use an adjustable spark tester to check the relative strength of the two coils and supporting parts. You open up the air gap until it fails to spark. Best done in a dim shop so you can see the spark. Be aware that it may arc in unwanted places if there is a weak point in the wire insulation anywhere.
Not unless you have a meter that can handle extremely high voltages. Like 50,000 volts.
Besides, the problem is usually resistance related and a direct measurement like that probably wouldn't reveal a problem. Similar to a battery that has good static voltage but can't crank over an engine.
You CAN use a normal DVM to measure coil resistance, though. There is a test procedure in the FSM.
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Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.
Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.
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Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.
