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Home >> Jeep >> 1991 >> Grand Wagoneer 36RH >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests - CARBURETED >> Timing Control Systems >> Ignition Coil Primary Circuit

Ignition Coil Primary Circuit

  1. Turn ignition on. Connect voltmeter between coil positive (+) terminal and ground. If reading is 5.5-6.5 volts, go to next step. If reading is battery voltage, go to step 4). If reading is lower than 5.5 volts, go to step 7).
  2. Place ignition switch in START position. With voltmeter connected between coil positive (+) terminal and ground, observe voltmeter reading while engine is cranking. If reading is battery voltage, primary circuit is okay. If reading is less than battery voltage, go to next step.
  3. Check for short or open circuit in wire attached to "I" terminal at starter motor solenoid. Also check starter solenoid for proper operation. Repair wiring or replace components as necessary.
  4. With voltmeter connected between coil positive (+) terminal and ground, disconnect wire from "I" terminal at starter motor solenoid. If reading remains at battery voltage, go to next step. If reading drops to 5.5-6.5 volts, replace starter motor solenoid.
  5. With voltmeter connected between coil positive (+) terminal and ground, connect a jumper wire between coil negative (-) terminal and ground. If reading drops to 5.5-6.5 volts, go to next step. If reading is still incorrect, go to step 8).
  6. Turn ignition off. Check continuity of green wire between coil negative (-) terminal and ignition module. If continuity is okay, replace ignition module. If not, repair Green wire as necessary. Also check continuity between ignition module Black wire connector terminal and ground. Repair Black wire as necessary and go back to step 2).
  7. With voltmeter connected between coil positive (+) terminal and ground, disconnect ignition coil capacitor. If reading is now 5.5-6.5 volts, replace ignition coil capacitor. If reading is still incorrect, go to next step.
  8. Turn ignition off. Check resistance between coil positive (+) terminal and bulkhead connector (Yellow wire). If reading is 1.4 ohms or more, repair or replace primary circuit resistance wire. If reading is 1.3-1.4 ohms, go to next step.
  9. With ignition off, check resistance between bulkhead connector and ignition switch terminal No. 11 (Yellow wire). If resistance is less than 0.1 ohms, replace ignition switch or repair Red ignition switch wire coming from battery. If reading is more than 0.1 ohms, repair poor connections or wiring at ignition switch or bulkhead connector.
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