Resistance Check - High Energy Ignition (HEI) System

Fig. 10 H.E.I. distributor ignition coil ohmmeter test. Units with external coil:

Fig. 11 Distributor pickup coil ohmmeter test:

1. Remove cap and coil assembly.
2. Inspect cap, coil and rotor for spark arc-over.
3. On inline engines:
a. Connect ohmmeter, Fig. 10, step 1. If reading is not infinite, replace coil.
b. Connect ohmmeter, Fig. 10, step 2. If reading is not zero or near zero, replace coil.
c. Connect ohmmeter, Fig. 10, step 3. If reading is infinite, replace coil.
4. Connect an external vacuum source to the vacuum advance unit. Replace vacuum unit if inoperative.
5. If vacuum unit is operating properly, connect ohmmeter, Fig. 11, step 1. If ohmmeter reading on middle scale is not infinite at all times, pickup coil must be replaced.
7. With ohmmeter connected, Fig. 11, step 2, reading should be within 500 to 1500 ohms. Tester J-24624 is required to test the module. If this tester is not available, and malfunction still exists after performing the above checks, replace module.