Edmunds Answers



  • zaken1 04/09/09 12:27 am PST

    There are two different coil designs used in that vehicle. One has flat spade connectors in the harness plug for the coil; and the other design has round connectors in the harness plug for the coil.

    The coil with the round connectors in the plug is known to be a bad design, and those harness plugs often do not make contact with the terminals in the coil. When those connectors are not making contact; it will seem like the coil has burned out; but the coil is still good. The problem is in the harness plug. It may be that the connectors have opened up, and do not fit right anymore; or it may be that the connectors are poorly crimped onto the wires that attach to them.

    So the fix for this problem is to either compress the connectors so that they fit securely onto the coil terminals, or repair the crimp so that it makes a solid contact with the wire. You probably can also buy a new harness plug from a Jeep dealer, and just install it to replace the old one.

  • gear_head1 08/03/11 9:57 am PST


    I just want to add some clarification to your excellent answer. Yes, there are two design types, pin and spade. The spade design is superior to the pin type. Unfortunately, the pin type harness is no longer available from Jeep/Chrysler.

    Spade type harnesses are available for about $20 (Chrysler P/N 5102401-AA). Of course, the coil will have to be replaced if converting the harness. When ordering the harness and coil, order for 1997 Jeep 4.0/5.2 (they use the same coil). 1997 was the model year in which the conversion from pin to spade was made.

    I have done this conversion on at least half a dozen customer vehicles, and all are still running as they should.

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