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Home >> GMC >> 1999 >> C3500 HD 6.5 F, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Diagnostic Procedures >> Basic Ignition System Checks >> Dis (Except 3.4L) >> Ignition Coil Test (4.8L, 5.3L & 6.0L)

Ignition Coil Test (4.8L, 5.3L & 6.0L)

  1. Turn ignition off. Disconnect wiring from ignition coils.
  2. Using DVOM, measure resistance between ignition coil terminal "A" and ignition coil mounting bracket. See appropriate wiring diagram in WIRING DIAGRAMS article. Replace ignition coil if resistance is not 0-10,000 ohms.
  3. Using DVOM, measure coil secondary resistance. Replace ignition coil if resistance is not 3000-7000 ohms.
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