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Selector switch for 1971 50hp evinrude model 50172S

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  • Selector switch for 1971 50hp evinrude model 50172S

    Need some help wiring a selector switch for 1971 50 hp evinrude model 50172S . I can't figure out which wires goes where I have a green,blue,purple-green,purple. I have 3 prongs on the bottom one has R one has F and one has +. At different times I've had forward and neutral and no reverse than I had neutral and reverse and no forward please help. Motor runs good.

  • #2
    Are you sure you have the correct switch ?------That system is in forward when motor is NOT running.-------12 volts is applied to green to get neutral.------12 volts is applied to both wires ( green and blue ) to get reverse.---------No voltage required anywhere to get forward gear.-----Motor must be TURNING to provide oil pressure to shift function !

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    • #3
      I'm pretty sure I do it's look like the rest of the one on line I'm thing I have the wiring going to the wrong prong ?

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      • #4
        Is this a new switch you have ?------A new to you motor ?-----Did the problem show up suddenly ?-----Some simple testing can be done.----Interested in how to do this with simple steps , yes or no ?

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        • #5
          I bought the boat,motor and trailer there was no switch, they had it wired to toggle switchs I bought the switch on ebay I wanted it back original because the switch was still available and yes I can take all the wires involved off and started from scratch

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          • #6
            Do you have a part # for the switch you have now.-----There are 2 different switches and step # 1 is to determine if you in fact have the correct one.-----One system needs 12 volts applied to get forward gear.----The system on your motor defaults to forward with no voltage needed !

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            • #7
              The part number for the switch I have is 279090.

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              • #8
                That is the correct part #.---Turn ignition switch to on..---With forward button pushed in there should be no voltage to the blue or green wire.-----With neutral pushed in there should be 12 volts to the green wire.-----With reverse pushed in there should be 12 volts to blue AND green.-----Have you confirmed that the wires going into the lower unit are hooked up correctly ?----Green to green.----Blue to blue.----What oil is in the lower unit ?------The solenoids do not move the clutch dog.----The solenoids direct oil pressure.----Motor must be turning to do the shifting.

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                • #9
                  Do you have a multi-meter / ohmmeter ?

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                  • #10
                    Any pictures of the terminals on this 279090 switch.----Just puzzled as to why there is an F as there is no voltage required for forward.

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                    • #11

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                      • #12
                        I'm not sure what wire goes where now the wiring diagram I pulled up has the colors that go to the switch but not what color goes to what prong they go to..

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                        • #13
                          Purple goes to positive.--------Then try blue to R and green to F------If It does not work correctly then change the blue and the green around.------No damage can be done if they are wrong the first time.

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                          • #14
                            Does a purple with green stripe go anywhere because the diagram I'm looking at say it goes to the switch

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                            • #15
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                              Purple and purple/ green are the power supply and both go to the same terminal------. One from the battery and one from the blocking diode--------You do have the blocking diode in the controls / wiring I hope.
                              Last edited by racerone; February 6th, 2019, 04:50 PM.

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