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  • Overheat alarm goes off right away...

    Hi,
    I have a 1990 75hp Merc 3 cyl oil inj.
    When I turn the key from "off" to "on", the self-check beep goes off, then it changes pitch a bit and stays on continuously - as if it's the overheat alarm. This is with the motor not even being on! Is this a bad temp sensor, or bad alarm?
    Does the heat sensor ground to the block?
    Thanks for any help...

  • #2
    Could be oil sensor, overheat sensor or bad warning module.
    Regards
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