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Thread: Magnetic Pickup passes Ohms test, but still bad?

  1. #1

    Default Magnetic Pickup passes Ohms test, but still bad?

    SBF, MSD 6AL, Blaster High Vibration Coil, MSD 8584 billet distributor. Ignition went away while driving on a warmed up vehicle. Checked for fuel at carb, good. Checked MSD box spark, excellent. Wife brought me my multi-meter. First checked voltage to MSD box (13.2 volts). Then checked primary and secondary resistance on the coil, both well within spec. Checked resistance of green/purple wires from box to distributor, both fine. Checked resistance of magnetic pickup, within spec (630 Ohms). Dayum, still stuck.

    Got the car flat-towed home and let it completely cool off. Still had a no-start condition on a cold car despite engine turning fine and even retested that I was getting a spark. On a hunch, and because I had a new spare on the shelf, decided to swap in a new magnetic pickup. Car fired right back up! So did I measure a false positive? Do these things just decide to go bad or experience any kind of intermittent failure? I need some confidence that this gremlin is behind me (not to mention that I now keep that spare in the car’s tool bag and not in a storage cabinet). Thanks for the inputs!

  2. #2
    Join Date
    Jan 2010
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    Brisbane, Australia
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    Default

    The resistive loop could still measure at 630 Ohms, but was either leg checked for short to ground?
    Regards, Gary

  3. #3

    Default

    Thank you for the reply, Gary. No, I did not check for that. Did not observe anything unusual with the pickup wiring, but that doesn’t mean there wasn’t a break or abrasion somewhere. The entire two-wire harness from the MSD box to the pickup connection is sheathed in conduit as well.

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