White Wire Trigger:
If you are 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.
If there is no spark:
1. Inspect all of the wiring.
2. Substitute another coil and test again. If there is now spark, the coil is at fault.
3. If there is still no spark, check to make sure there is 12 volts on the small Red wire from the MSD when the key is in the On position. If 12 volts are not present, find another 12 volt source and repeat the test.
4. After inspecting the test procedures and inspecting all of the wiring, there is still no spark, the Ignition is at fault. See the Warranty and Service Page for Information.
Magnetic Pickup Trigger:
If you are using the 2-Pin Magnetic Pickup 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 Magnetic Pickup connector from the distributor.
4. Turn the ignition to the On position. DO NOT CRANK THE ENGINE.
5. With a small jumper wire, short the Green and Violet magnetic pickup wires together then pull the jumper off. Each time the short is removed a spark should jump If spark is present, the ignition is working properly.
If there is no spark:
1. Inspect all of the wiring.
2. Substitute another coil and test again. If there is now spark, the coil is at fault.
3. If there is still no spark, check to make sure there is 12 volts on the small Red wire from the MSD when the key is in the On position. If 12 volts are not present, find another 12 volt source and repeat the test.
4. After inspecting the test procedures and inspecting all of the wiring, there is still no spark, the Ignition is at fault. See the Warranty and Service Page for Information.
http://www.msdignition.com/page.aspx?id=3206
http://www.msdignition.com/pdf/WireDiagrams/WDTN.PDF
http://www.msdignition.com/page.aspx?id=3206
http://www.msdignition.com/troubleshooting.aspx
http://www.msdignition.com/uploadedFile ... op_ten.pdf
http://www.msdignition.com/page.aspx?id=4209
http://www.ehow.com/how-does_4809570_tr ... butor.html
wet, loose, or broken electrical connectors or corrosion on connectors, are also a possibility and a cause of intermittent problems, but don,t over look a bad coil,blown fuses, fouled spark plugs, bad or burnt ignition wires, bad engine grounds or low battery voltage as potential problems
