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1987 Mercury 70hp "power trim" not working

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  • 1987 Mercury 70hp "power trim" not working

    put the battery in my boat today to get it cleaned up an running for the year, got it running but the trim is not working, no sound, nothing, looked for a fuse somewhere but couldn't find anything, all the wires look good

    anyone have any idea ?


  • #2
    Re: 1987 Mercury 70hp "power trim" not working

    Hey puckoach,

    Let me preface this by saying that I ask a LOT more questions than I can answer.

    When I first got into my boat this spring I experienced the same type of issue. When I first tried to tilt my motor all the motor would do would 'click'. I knew my battery was good as I just bought it last fall and kept it inside through the harsh winter.

    In my case, since it was so cold for so long this winter,(I'm near St. Louis) the fluid in the cylinders had become so viscous that the t/t motor couldn't move the outboard.

    What I did was release the manual knob on the tilt motor and I manually lifted and lowered the the outboard to clear the cylinders and the lines. It was difficult at first, but became easier the more I lifted and lowered it.

    Then I refilled the tilt reservoir, bled the system, and topped off the tank. Have not had one issue since then.

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    • #3
      Re: 1987 Mercury 70hp "power trim" not working

      Have you checked to make sure the tilt switch (in your controls) is good? Does your motor have a tilt switch mounted on the motor itself? This motor does have a solenoid mounted near the oil tank, and I believe the fuse for the tilt system is located in this area. Also, I remember a separate (3 flat plug) wiring harness leading to the t&t unit. Make sure the plug is connected and solid.

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      • #4
        Re: 1987 Mercury 70hp "power trim" not working

        I was wondering if the switch might be bad also, it doesn't click or anything when I move it up or down

        ill check the solenoid area for a fuse

        thank you

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        • #5
          Re: 1987 Mercury 70hp "power trim" not working

          If you disconnect the three wires from the switch, touch two of them together (up or down) and either the motor will click and move, or it wont. If nothing happens.....then its probably the fuse or switch itself. If you have a test light, the middle wire (of the switch) should be hot. If not, trace the harness back until you find the connector. Make sure its tight and secure. Trace it back further and it leads you to the fuse and solenoid area. Keep digging...you will find t through the process of elimination.

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          • #6
            Re: 1987 Mercury 70hp "power trim" not working

            Clean All connections related to starter.

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            • #7
              Re: 1987 Mercury 70hp "power trim" not working

              took the switch off the control yesterday and had it tested last night, buddy said its not that, he said its probably a relay or fuse or solenoid

              I did find a fuse on the motor but it was good, not sure if it was for the tilt or not, does anyone know where abouts the solenoid is, I have no idea what Im looking for

              maybe a diagram somewhere ?

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              • #8
                Re: 1987 Mercury 70hp "power trim" not working

                Forget what I posted about starter. got confused. But it's back on top

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                • #9
                  Re: 1987 Mercury 70hp "power trim" not working

                  found out my issue, at the end of the harness from the switch down near the drain plug we found this 3 way plug that was all corroded, we ended up cutting the plug off and soldering and heat shrinking the wires together, works as good as new now



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                  • #10
                    Re: 1987 Mercury 70hp "power trim" not working

                    I kind of thought that me be the issue. I had some problems with that connector as well. The flat metal inside the plug is famous for this .

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                    • #11
                      I'm having the same issue, that I haven't resolved yet. But for corroded connections I use CLR (or equivalent) to clean them. Just soak your (disconnected from the power source) corroded connections in CLR for a few minutes and rinse off with clear water; dry off and they look like new. Coat connectors in grease for future protection. It saves on the cutting and soldering....

                      Comment


                      • #12
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                        I'm having the same issue, that I haven't resolved yet. But for corroded connections I use CLR (or equivalent) to clean them. Just soak your (disconnected from the power source) corroded connections in CLR for a few minutes and rinse off with clear water; dry off and they look like new. Coat connectors in grease for future protection. It saves on the cutting and soldering....

                        Comment

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