MOTORCRAFT DURA-Spark II Ignition Systems: Testing: Notes

NOTE: All wire colors shown refer to colors of electronic control module wires. When making tests, wires must be traced back to control module for proper color identification. Also, when a test is completed and a problem is found, make the necessary repair and repeat the failed test to be sure that problem has been corrected.

CAUTION: When checking the secondary voltage, do not remove the following spark plug wires while the engine is running or cranking:

Plug No. 1 or 8 on V8 engines.
Plug No. 3 or 5 on 6 Cylinder engines.
Plug No. 1 or 3 on 4 Cylinder engines