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1988 4.3L shutdowns when the Alt. Belt slips

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  • 1988 4.3L shutdowns when the Alt. Belt slips

    Why is my 1988 4.3L Mercuiser Sputtering then shutting off when my alternator belt slips instead of running off the battery. Is this normal for that engine. Most Engines would keep running off the battery but this one seems to be running strictly off the alternator. I have a new alternator belt on but I’m hesitant to go out unless I know that this is normal. By the way The battery is brand new and fully charged.

  • #2
    Why doesn’t my 1988 4.3L mercuiser motor run on just the battery when my alt. belt started slipping. Is this normal for this engine? When I was tooling across the lake the belt started slipping and the engine kept turning off. I have a new bet in now but am hesitant to take it out until I know. By the way the battery is brand new and fully charged

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    • #3
      Engine should run for a few hours on the battery alone. The belt slipping could also be a sign of another problem, like a shorted diode in the alternator, which could lead the the load on the battery being high enough to drop the voltage below the threshold of the ignition system, and stall the engine....

      To test, disconnect ALL the wires from the alternator, insulate them with tape and start the engine and run it... If it runs without stalling, replace/repair the alternator...

      Chris...
      xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
      The world takes on a whole new perspective when viewed from 100’ below.
      1972 Bertram ‘Bahia Mar’ 20
      2006 Mercruiser 4.3MPI (0W617679) w/Alpha One Gen II (0W829301)
      (Original - 1972 '165' In-line 6. Previous - 1994 4.3LX)


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      • #4
        Only way I see this happening is if the ALT shorted out.
        Put muffs on the drive and turn water on full. Start the motor and measure the voltage at the battery. Before motor is started, bat should measure 12.7V or close to. Once motor starts and is reved above 1500 rpms, there should be a steady 14+V from idle on up
        94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
        95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
        07 Seadoo GTX
        Merc Adults Only VP Adults Only
        G-Dad always said "First Liar doesn't stand a chance"

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        • #5
          Two threads going
          https://forums.iboats.com/forum/boat...alt-belt-slips
          94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
          95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
          07 Seadoo GTX
          Merc Adults Only VP Adults Only
          G-Dad always said "First Liar doesn't stand a chance"

          Comment


          • #6
            Sign up today
            Originally posted by AllDodge View Post
            Not anymore.
            BOAT SPECS FORUM HELP STARCRAFT FORUM SHOP iboats
            Please, no PM's (Private Messages) regarding boat/engine problems.
            That is what the forums are for.
            Only forum/moderator issues will be answered in PM's.

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