Chrysler Full-Size Trucks 1997-2000 Repair Guide

Ignition Coil

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TESTING IN PLACE



  1. Disconnect the coil lead from the center terminal of the distributor cap and hold it about 1 / 2 " from a good ground on the engine.
  2.  
  3. Crank the engine. If spark occurs, the problem is probably in the distributor. If there is no spark, the problem is the coil or an upstream component.
  4.  


CAUTION
Coil output is very high. Be sure to insulate yourself from the coil wire during the test.



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Fig. Checking coil for spark with component in place. For safety, insulate yourself from the lead

LOCATION



On 2.5L engines, the coil is mounted on a bracket and located behind the distributor.

On 3.9L, 5.2L, and 5.9L LDC engines, the coil is mounted to a bracket bolted to the front of the right cylinder head. The bracket is secured to the automatic belt tensioner bracket.

On 5.9L HDC engines, the coil is mounted to a bracket bolted to the air injection pump mounting bracket.

TESTING



Useful tests can be carried out with an ohmmeter.

  1. Disconnect the primary wires and the lead to the distributor.
  2.  
  3. Check the resistance across the primary wire connectors. It should be about 1 ohm.
  4.  
  5. Check the resistance between the one of the primary wire connectors and the high-tension lead. It should be about 12-15 kilo-ohms.
  6.  
  7. If resistance is not within spec, replace the coil.
  8.  



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Fig. Checking secondary winding resistance

REMOVAL & INSTALLATION



  1. Disconnect the battery negative terminal.
  2.  
  3. Disconnect the primary wires from the coils.
  4.  
  5. Disconnect the high-tension lead.
  6.  
  7. Remove the securing bolts to remove the coil.
  8.  
  9. Installation is the reverse of removal.
  10.  


CAUTION
On 3.9L, 5.2L and 5.9L LDC engines, the coil bracket is under tension. Do NOT attempt to remove it unless accessory drive belt tension is relieved.



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Fig. Ignition coil location to the rear of the distributor-2.5L



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Fig. Disconnecting the primary wires



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Fig. Ignition coil location is on the right side of the block-3.9L, 5.2L, and 5.9L LDC engines



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Fig. Ignition coil location on the AIR pump bracket-5.9L HDC engine

 
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