MSD's ignition system produces multiple ignition sparks at each spark plug, rather than just a single spark with conventional ignition systems. This multiple spark technology greatly increases efficiency and power. If the MSD system does not seem to operate properly, a simple test can be used to determine whether the coil or the MDS product is at fault.
Turn the vehicle's ignition switch to the "Off" position, then pull the coil wire off of the center of the distributor cap.
Disconnect the white-colored wire from the MDS ignition box, then turn the ignition switch to the "On" position, but do not turn the engine over.
Hold the end of the coil wire approximately 1/2 of an inch away from a metal surface, then tap the free end of the white colored wire against any ground point, such as a clean metal piece of the vehicle. A spark should visibly jump the gap between the coil wire and the ground point.
Replace the coil if a spark did not jump the gap between the coil wire and the ground surface, then repeat the test. If a spark jumps the gap with the replacement coil, the original coil was defective. If a spark does not jump the gap, the ignition box must be serviced by MSD.
