1968 plymouth roadrunner tac.

Electrical and Ignition

  1. crazylarry74

    crazylarry74 crazylarry74

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    Jun 23, 2019
    Location:
    hudson ma 01749
    just got my 68 running after 20+ years of sitting any way the factory tac moves when I hit the key but when running not working checked all wires look test good is it bad?

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  2. Rich B

    Rich B Well-Known Member

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    Location:
    Minot, ME
    Probably tach runs from coil- may have polarity reversed? Coils will only work connected right which way. Yup, learned that one the hard way too.
     
  3. Big John

    Big John Sit back, relax Don't bitch about the cigar smoke

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    Sep 8, 2008
    The factory tachs weren't all that good to begin with. Check the wiring to the tach (as said), but there should be a gray wire coming from a plug in the firewall to the negative post on the coil. The power comes from the fuse block.

    That said, most likely the tach needs to be repaired. They do offer repops, but I always like to see the original stuff repaired and reused when possible. Someone here might have a good vendor for repairs.
     
    Rich B likes this.

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