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Thunderbolt IV start problem-gctid807243

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    Thunderbolt IV start problem-gctid807243

    Hello. I recently reinstalled my 1992 Mercruiser 5.7 carburated thunderbolt 4 ignition. I installed a updated ignition sensor and wasn't getting any spark. I reinstalled the old style and now the engine tries running while cranking but dies soon after the key returning to run position. fuel is good and I've also run it off separate fuel tank with no change. Ran the troubleshooting procedure in my manual and have power at coil and white/red wire on pickup coil. removed coil primary and tested output by grounding wht/grn wire with no spark.

    My question is by the test results it's leading to a bad coil but i'm not 100% sure all the wiring is correct. Any input would be appreciated.

    #2
    Electric fuel pump ?

    Run the fuel pump direct to the battery, engine runs good you narrowed down the problem.
    Be good, be happy, for tomorrow is promised to no man !

    1994 2452, 5.0l, Alpha gen. 2 drive. Sold ! Sold ! Sold !

    '86 / 19' Citation cuddy, Merc. 3.0L / 140 hp 86' , stringer drive. Sold ! Sold ! Sold !

    Manalapan N.J

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      #3
      no electric fuel pump.

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        #4
        Cycle the kill switch a few times.
        Be good, be happy, for tomorrow is promised to no man !

        1994 2452, 5.0l, Alpha gen. 2 drive. Sold ! Sold ! Sold !

        '86 / 19' Citation cuddy, Merc. 3.0L / 140 hp 86' , stringer drive. Sold ! Sold ! Sold !

        Manalapan N.J

        Comment


          #5
          Ill try that. Is the switch normally open or normally closed? Is there an easy way to bypass the kill switch?

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            #6
            Try a temporary jumper from +12 volt source to your +coil terminal. See if she goes, if so pull the jumper to kill the engine when needed.
            Dave
            Edmonds, WA
            "THE FIX"
            '93 2556
            Carbureted 383 Vortec-Bravo II 2.0:1 18 1/4x19 P

            The rebuild of my 2556 https://www.baylinerownersclub.org/f...76?view=thread
            Misc. projects thread
            https://www.baylinerownersclub.org/f...56-gctid789773

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              #7
              Suggest you to fill out your SIG!

              If you have power at the ignition coil, it isn't the KILL SWITCH,
              Joon, Kathy, Jaden & Tristan
              Uniflite 42 AC, DD 671N
              93 3058 sold
              92 2855 (day boat)
              91 Fourwinns 205 (lake boat)
              Longbranch WA
              Life is Good

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