R 3500 P/U 2WD V8-454 7.4L VIN W 4-bbl (1988)
Ignition Coil: Testing and Inspection
Throttle Body Injection (TBI)
Ignition Coil Testing
PROCEDURE:
1.
Disconnect the distributor lead and wiring from the coil.
2.
Connect an ohmmeter as shown in step 1 of the image above. Use the high scale. The reading should be infinite. If not replace coil.
3.
Connect an ohmmeter as shown in step 2 of the image above. Use the low scale. The reading should be very low or zero. If not, replace coil.
4.
Connect an ohmmeter as shown in step 3 of the image above. Use the high scale. The meter should NOT read infinite. If it does, replace the coil.
5.
Reconnect the distributor lead and wiring to the coil.
