1989 Jeep 360, new coil, need resistor?

Engine, Transmission & Driveline

  1. mopar440

    mopar440 Active Member

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    Working on a 89 grand wagoneer w/ a 360. The connection for the coil is odd, and in bad shape. I opted to replace it with a coil with traditional post on it

    I picked a 1979 Cordoba coil. I thought it would match the ignition system close enough

    On the coil it says "use external resister)

    I know there's alot of debate about that, cannot get away with no resistor on this?
     
  2. Davea Lux

    Davea Lux Old Man with a Hat FCBO Gold Member

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    The Cordoba coil is not designed to run at 12 volts, it will over heat and burn out without a ballast resistor. It runs 12 V in the start position from the ignition switch with the resistor bypassed but as the engine starts the power is routed thru the resistor in the run position. In the run position the coil will get about 8 volts or so. You need to look up the wiring diagram for your jeep to see if a resistor or resistance wire was used with the factory coil setup. If the factory setup ran 12 volts all the time thru a single wire, you probably can not add a resistor and still have the jeep start correctly. The needs to be an independent start circuit and run circuit to use the resistor.

    Dave
     
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  3. 65sporty

    65sporty Old Man with a Hat

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    Like Dave said it would help to see a wiring diagram for the Jeep. I did look up a replacement coil on Rock Auto and the standard replacement requires a external resistor, so I would guess either it has a resistor or resistor wire. The connector your talking about is a Ford style coil connector, because Jeeps used Motorcraft ignitions for a lot of years.
     
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