I have tried the trouble shooting on my msd Digital 7 plus by doing the following. I did not have any luck with a spark. If I do not have access to another coil to test if my coil is bad, can you tell me how to test my coil? It is the hvc #8251. White Wire Trigger: Using the White wire (points or electronic amplifier) of the MSD to trigger the ignition, follow these steps. 1. Make sure the ignition switch is in the Off position. 2. Remove the coil wire from the distributor cap and position the terminal so it is approximately 1/2" from a good ground. 3. Disconnect the MSD White wire from the distributor points or the ignition amplifier. 4. Turn the ignition to the On position. DO NOT CRANK THE ENGINE. 5. Tap the White wire to ground several times. Each time the wire is pulled away from ground a spark should jump from the coil wire to ground. If spark is present, the ignition is working properly. Rick Henderson
