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What would cause the ignition coil to burn up on a 1993 Jeep Grand Cherokee when the engine warms up?
Kysweetie39
Many ignition coils (I don't know about the 93 Jeep) run the coil in two modes. During startup the coil runs at full voltage to help provide a slightly stronger spark and to make up for the fact that the starter is pulling the battery voltage down. After startup, many coils receive operating voltage through a resistor, effectively dropping the operating voltage of the coil, partially because many of the coils can't operate very long on full voltage that is provided by a normally operating alternator. Check the wiring diagram of your ignition. If it uses a coil, make sure the coil is in circuit and operating properly.
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∙ 17y ago
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