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Thread: Mysterious spark disappearance (MSD) not working

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  1. 05-29-2020, 04:32 AM #1
    718RSK
    718RSK is offline
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    Mysterious spark disappearance (MSD) not working

    My '73 is suffering from mysterious spark disappearance. Car always ran great but seem to have died over winter despite being on a trickle charger. Wiped out the odessey 925 battery also. Have another 12V battery hooked up for now but the car will not start (starter turns over fine) as the MSD box does not generate a spark. I have checked all wiring and it seems to be okay. To be sure I hooked up the wire coming from the ignition switch directly to the 12V battery. When rubbing it against the battery terminal the box makes a sound (not when just touching) and appears to generate a spark when starting the engine but only intermittently when rubbing and not continuously. Electrics are not my forte. It looks like I have an issue with the MSD unit itself, anybody out there have any pointers before I take the plunge and spend the $500 on a new one?

    TIA,

    JK
    P.S. have also tried a new coil, did not make a difference
    Last edited by 718RSK; 05-31-2020 at 09:53 AM.
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