LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Jeep >> 1982 >> Pickup J20, 4WD, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Ignition System >> MOTORCRAFT Solid State Ignition (SSI) >> Testing >> Secondary Circuit Check
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Secondary Circuit Check

CAUTION: When checking the secondary voltage, do not remove spark plug wires from spark plugs No. 1 or 5 on 6-cylinder engines nor from spark plugs No. 3 or 4 on V8 Engines.
  1. Disconnect coil wire from distributor cap. Use insulated pliers to hold wire approximately 1/2" from engine block or intake manifold.
  2. Crank engine and check for spark at gap. If no spark occurs, turn off ignition switch, and check resistance of secondary coil windings. See IGNITION COIL RESISTANCE CHECK SECONDARY RESISTANCE . Replace ignition coil if outside specifications.
  3. If spark occurred in step  2), connect coil wire to distributor cap. Remove wire from 1 spark plug. Using insulated pliers, hold wire 1/2" from engine head while cranking engine. Check for spark.
  4. If spark occurs, check for fuel problems or incorrect timing. If no sparks occur, check for defective rotor or distributor cap or for defective spark plug wires.
scientia non olet · About LEMON Manuals