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Testing for coil spark after locating the jeep ignition coil first thing i would do is to test spark coming from the plug wire post so to test for spark have your jeep in neutral or park if its an automatic be sure the emergency brake is full engaged and or wheels chocked to prevent it rolling over your toes or worse. The purpose of a jeep yj wiring harness is to deliver electrical and other information to places your rig needs it many of the jeeps systems have their own wiring harnesses for example your rig has a jeep transmission wiring harness and an engine wire harness assembly unfortunately over time wiring harnesses can wear out. Find jeep wiring connectors and pigtails and get free shipping on orders over 99 at summit racing. Page 1 of 4 how to test the ignition coil 1991 1997 40l jeep symptoms of a bad ignition coil how to test the ignition coil with a 12 volt test light and a spark tester cranks but does not start cherokee grand cherokee comanche wrangler