![]() The diagram below shows the proper installation for early Ford By installing this Diode in-line of the wire that goes to the Charging indicator, the voltage is kept from entering the MSD. If you are experiencing run-on, it is due to a small amount of voltage going through the charging lamp indicator and feeding the small Red wire even if the key is turned off.Įarly Ford and GM: To solve the Run-On problem, a Diode is supplied with the MSD in the parts bag. Because the MSD receives power directly from the battery, it does not require much current to keep the unit energized. This usually only occurs on older vehicles with an external voltage regulator. If your engine continues to run even when the ignition is turned Off you are experiencing engine Run-On. Contact MSD Tech with the manufacturer of your tach and what you have installed on it to determine which Tach Adapter you will need. On GM vehicles, first remove the tach filter. If your tachometer doesn't read correctly after installing an MSD, you may need a Tach Adapter. A suppression style or spiral wound spark plug wire MUST be used. Solid Core wires do not suppress any Electro Magnetic Interference (EMI) which will interfere with electronics or rev limiters on your vehicle. Solid Core Wires: You cannot run Solid Core Spark Plug Wires with an MSD Ignition Control. If one wire is out of that average spec, it is at fault Remember to divide the length of the wire by 12 to get a "per foot" measurement. If you do not know the specification for your wires, measure the resistance of each wire. Use care to make sure there is good contact or the readings will be inaccurate. Use an Ohm Meter and connect the terminals to the spark plug wire terminals. By checking the resistance of each wire you will determine two things: That there is continuity (not open) and if there is too much resistance in the wire. If you suspect a spark plug wire to be open causing poor performance, check the resistance of each wire. NOTE: The Ignition will check good if the pickup is at fault. If the wiring is okay, the pickup is at fault. If the resistance is out of this specification, inspect the condition of the wires leading to the pickup for abrasion, shorting or opens. The resistance should be within 400 - 1,300 ohms. ![]() Once again, connect the Ohm meter's leads to the two terminals of the pickup. The magnetic pickup in MSD Distributors can also be checked with an Ohm meter to make sure it is within operating specifications. This is especially prevalent on engines with a chrome or stock timing chain cover that is actually bowing forward allowing the cam to "walk". On Chevrolet engines, if the timing is retarding 10 - 20 degrees inspect for cam-walk.The correct polarity is whichever connection gives the most retarded timing. Reverse the connectors and check the timing again. Check the polarity of the magnetic pickup wires of the distributor.It is best to route it along a ground plain such as the firewall, frame or engine block to form a shield around it. It should be routed clear of the coil primary wires and plug wires. Inspect the routing of the Magnetic Pickup Harness.Make sure you are not using Solid Core wires.Try another non-adjustable light and check the timing again. Dial back timing lights are not recommended. What kind of timing light are you using? Many lights have trouble reading the MSD's capacitive discharge multiple sparks.If your timing seems to be jumping all over the place, check the following items:
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