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Thread: Resistance in spark plug wire

  1. #1

    Default Resistance in spark plug wire

    Hi people.

    Does anybody know what resistance (ohm) it should be in the spark plug wire (the one going from the coil and down onto the sparkplug)??

  2. #2
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    Quote Originally Posted by 520John
    Hi people.

    Does anybody know what resistance (ohm) it should be in the spark plug wire (the one going from the coil and down onto the sparkplug)??
    Depending on the accuracy of your meter - really, really close to zero.

    Car Info is HERE

  3. #3

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    Quote Originally Posted by shrike071
    Depending on the accuracy of your meter - really, really close to zero.
    I set the ohm meter to 200k and it measured 2,4????

  4. #4
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    Spark plug lead resistances are generally very high iirc. Something about noise supression.

  5. #5

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    Quote Originally Posted by Ferret
    Spark plug lead resistances are generally very high iirc. Something about noise supression.
    So its ok with the 2,4 at 200K??

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    yeah that means 2.4K ohm resistance, it's probably fine, though someone will have to find the stock spec for the leads...

  7. #7
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    I remember something in the Bentley's about there being a .1 or lower on the M50's coil-on leads

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  8. #8
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    I also seem to remember that spark plug leads have a resistance of a few kOhms. 2.4k sounds about right to me.

  9. #9
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    When I was researching the plug wires for my '89 with the M20, I was looking into making my own wires and had found a few places that sell the plug wire ends. The ends are 5000 Ohm resistance.

  10. #10
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    Quote Originally Posted by 520John
    Hi people.

    Does anybody know what resistance (ohm) it should be in the spark plug wire (the one going from the coil and down onto the sparkplug)??
    Spark plug wires: 0 ohms (appox.)
    Spark Plug ends: 5.0 +/- 1.0 kohm
    1992 525i Touring M50 5spd Manual 230k+ miles - SOLD:-(

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