Ram B1500, B2500, B3500, 1999-2003

Ignition Coil

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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.

Removal & Installation



The ignition coil is an epoxy filled type. If the coil is replaced, it must be replaced with the same type. The coil is mounted to a bracket that is bolted to the front of the right engine cylinder head. This bracket is mounted on top of the automatic belt tensioner bracket using common bolts.

  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the primary wiring from the ignition coil.
  4.  
  5. Disconnect the secondary spark plug cable from the ignition coil.
    WARNING
    Do not remove the coil mounting bracket-to-cylinder head mounting bolts. The coil mounting bracket is under accessory drive belt tension. If this bracket is to be removed for any reason, all belt tension must first be relieved. Refer to the belt section of Engine Mechanical.

  6.  
  7. Remove ignition coil from coil mounting bracket (two bolts).

    Click image to see an enlarged view

    Fig. View of the accessory drive belt tensioner (1), coil connector (2), ignition coil (3) and coil mounting bolts (4)

  8.  

To install:

  1. Install the ignition coil to coil bracket. If nuts and bolts are used to secure coil to coil bracket, tighten to 100 inch lbs (11 Nm. If the coil mounting bracket has been tapped for coil mounting bolts, tighten the bolts to 50 inch lbs. (5 Nm).
  2.  
  3. Connect all wiring to ignition coil.
  4.  

  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

3.9L, 5.2L & 5.9L Engines

The ignition coil is an epoxy filled type. If the coil is replaced, it must be replaced with the same type.

On 3.9L or 5.2L and 5.9L LDC gasoline engines, the coil is mounted to a bracket that is bolted to the front of the right engine cylinder head. This bracket is mounted on top of the automatic belt tensioner bracket using common bolts.

On the 5.9L DC gasoline engine, the coil is mounted to a bracket that is bolted to the air injection pump (AIR pump) mounting bracket.

  1. Disconnect the primary wiring from the ignition coil.
  2.  
  3. Disconnect the secondary spark plug cable from the ignition coil.
    CAUTION
    do not remove the coil mounting bracket-to-cylinder head mounting bolts. The coil mounting bracket is under accessory drive belt tension. If this bracket is to be removed for any reason, all belt tension must first be relieved. Refer to the belt section of the Engine Mechanical Section.

  4.  
  5. Remove ignition coil from coil mounting bracket (two bolts).

    Click image to see an enlarged view

    Fig. View of the accessory drive belt tensioner (1), coil connector (2), ignition coil (3) and coil mounting bolts-3.9L, 5.2L and 5.9L LDC engines



    Click image to see an enlarged view

    Fig. View of the coil mounting bolts (1), ignition coil (2), coil electric connector (3) and secondary cable (4)-5.9L HDC engine

  6.  

To install:

  1. Install the ignition coil to coil bracket. If nuts and bolts are used to secure coil to coil bracket, tighten to 100 inch lbs. (11 Nm). If the coil mounting bracket has been tapped for coil mounting bolts, tighten the bolts to 50 inch lbs. (5 Nm).
  2.  
  3. Connect all wiring to ignition coil.
  4.  

Testing



Useful tests can be carried out with an ohmmeter.

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

    Click image to see an enlarged view

    Fig. Checking secondary winding resistance

  8.  

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.  



Click image to see an enlarged view

Fig. Checking secondary winding resistance

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.



Click image to see an enlarged view

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

 
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