Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la
If it fails: lemon-manuals.org.ua

Or, hide this message: temporarily or permanently

Ignition Coil: Testing and Inspection


Ignition Coil Test:





1. With the ignition switch OFF, remove the distributor ignition (DI) cap.

Ignition Coil Test:




2. Remove the two screws to disconnect the BLK/YEL and WHT/BLU wires from the terminals A (+) and B (-) respectively.
3. Using an ohmmeter, measure resistance between the terminals. Replace the coil if the resistance is not within specifications.

NOTE: Resistance will vary with the coil temperature. Specifications are at 68°F (20°C).

Primary Winding Resistance
(between the A and B terminals): 0.63 - 0.77 Ohms

Secondary Winding Resistance
(between the A and secondary winding terminals): 12.8 - 19.2 kOhms