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Mercruiser Thunderboat v Coil question

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  • Mercruiser Thunderboat v Coil question

    Manual indicates that coil is external resistor type. Where is the resistor(s) located??????? This is confusing. Help!

  • #2
    Originally posted by tank1949 View Post
    Manual indicates that coil is external resistor type. Where is the resistor(s) located??????? This is confusing. Help!
    The TBV does not use an external resistor, if your coil states to use with an external resistor then you have the wrong coil.

    Points distributors use an external resistor and it is the resistance wire (purple) which is feeding the coil
    94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
    95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
    07 SeaDoo GTX
    Raw Water Pump Maintenance
    Merc Adults Only

    Comment


    • #3
      Originally posted by AllDodge View Post

      The TBV does not use an external resistor, if your coil states to use with an external resistor then you have the wrong coil.

      Points distributors use an external resistor and it is the resistance wire (purple) which is feeding the coil
      My coil states this. In addition, Wholesale Marine list them and they plainly display "external resistor." https://www.********************/igni...SABEgIErvD_BwE

      Comment


      • #4
        Wholesale marine links do not work at iboats

        I'm guessing its a Sierra part and shows to use with external resistor, and probably also says can be used with TB4 and 5 ignition. That said, first I don't use Sierra parts but offer this.

        Sierra part number 18-5433 has an internal resistor
        Sierra part number 18-5438 requires an external resistor

        Use which ever you want, they will both work. Also coils hardly ever go bad, but they get replaced a lot.

        Don't know what motor your working on
        94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
        95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
        07 SeaDoo GTX
        Raw Water Pump Maintenance
        Merc Adults Only

        Comment


        • #5
          Originally posted by AllDodge View Post
          Wholesale marine links do not work at iboats

          I'm guessing its a Sierra part and shows to use with external resistor, and probably also says can be used with TB4 and 5 ignition. That said, first I don't use Sierra parts but offer this.

          Sierra part number 18-5433 has an internal resistor
          Sierra part number 18-5438 requires an external resistor

          Use which ever you want, they will both work. Also coils hardly ever go bad, but they get replaced a lot.

          Don't know what motor your working on
          So where would the external resistors be located? Under helm? Back of block? ???? This is what is confusing to me.

          Comment


          • #6
            Sign up today
            The external resistor is a resistance wire, it looks like any other purple wire, but the one going to the coil IF designed for the use will have resistance in it. Many years ago when points were used they would actually install a ceramic resistor and mount it close to the coil. Since then they just make a wire which has the resistance built in.

            Disconnect the battery and the purple wire going to the coil and the one on the choke. Take a ohm meter and measure the resistance between the choke purple wire and the coil purple wire
            94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
            95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
            07 SeaDoo GTX
            Raw Water Pump Maintenance
            Merc Adults Only

            Comment

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