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Mercruiser trim motor control - Boscoe? anyone?

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  • Mercruiser trim motor control - Boscoe? anyone?

    I happened across this information today - and am trying to puzzle it out.

    It appears (at least some) Mercruiser drives use a single relay to operate the trim motor

    and the trim motor has a ground
    as well as the familiar blue (presumably up) and green (presumably down)
    to provide the +

    what surprises me is that the green power is provided directly through the control switch -
    no relay involved.

    Any thoughts on that?

    (its also interesting that the control switch has three buttons -
    two for 'up' - apparently one in series with a limit switch)




  • #2
    looks to me that the button switches are heavy duty so a relay is not needed to carry the current.
    the in and out does confuse me
    Last edited by 99yam40; 06-24-2019, 09:19 AM.

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    • #3
      You have a trim up and a trailer button, that trims the drive all the way up.

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      • #4
        Originally posted by 99yam40 View Post
        looks to me that the button switches are heavy duty so a relay is not needed to carry the current.
        must be;
        except not the 'trim limit' switch -
        so they run the blue through a relay.

        I suppose,
        since there is no powerhead being moved around,
        just the drive housing -
        the amp draw of the trim motor may be a fraction of that of an outboard

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        • #5
          That's a really old system there. I'm going to guess something like mid-80's and earlier. Since about then, there are two solenoids being used - one up and one down solenoid. I wonder why the change, though - was it because that old system was flawed... or is the newer system actually less expensive to produce? I dunno.
          2000 Yamaha OX66 250HP SX250TXRY 61AX103847T
          1982 Grady Weekender/Offshore (removed stern drive & modded to be an OB)

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