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Home >> Jeep >> 2003 >> Grand Cherokee Laredo, 4.0 S, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Diagnostic Procedures >> Ignition Systems >> Direct Ignition System >> Ignition Coil Power Source
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Ignition Coil Power Source

Turn ignition on. Using voltmeter, check voltage between terminal "B" and ground of each ignition coil plug. Battery voltage should exist.

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