GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1998 🢒 GMC C-Series Medium Duty Truck B7 🢒 Engine 🢒 Engine Electrical 🢒 Ignition Coil Not Operating Properly

Tools Required

J 39200 Digital Multimeter

  1. Turn OFF the ignition switch.
  2. Disconnect the distributor lead and wiring from the ignition coil.

    3. Notice: Do not insert the J 39200 digital multimeter probe into the ignition coil connectors. The female terminals could be deformed, resulting in intermittent operation. Only make contact with the front edge of the terminals.


    Object Number: 43746 Size: SH
  3. Connect an ohmmeter as shown.
    4. • Use the high scale.
    • If the reading is not infinite, replace the coil. Refer to Ignition Coil Replacement in Ignition Coil and Ignition Coil Module Replacement .

    Object Number: 43747 Size: SH
  4. Connect an ohmmeter as shown.
    5. • Use the low scale.
    • The reading should be 0.1 ohms. If not, replace the coil. Refer to Ignition Coil Replacement in Ignition Coil and Ignition Coil Module Replacement .

    Object Number: 43749 Size: SH
  5. Connect an ohmmeter as shown.
    6. • Use the high scale.
    • If the reading is not 5-25k ohms, replace the coil. Refer to Ignition Coil Replacement in Ignition Coil and Ignition Coil Module Replacement .
  6. Reconnect the distributor lead and wiring to the coil.