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AmazonThe exciter coil has a small amount of electrical current induced in it as a magnet attached to the inside of the flywheel passes it. This current is used to charge the capacitor in the CDI unit.
Testing the charge (exciter) coil
The charge coil is another name for the exciter coil. Cranking with the direct voltage adapter, it should put out about 144 volts unloaded, rising to about 170 at 1500 RPM. If both the charge coil and the pulser coil test within spec, and the ignition coils do too, the CDI unit is the likely fault.