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Author Topic:   3 way switch for trim???
JohnNorthEast posted 04-24-2002 09:46 AM ET (US)   Profile for JohnNorthEast   Send Email to JohnNorthEast  
I'm in the process of re wiring an 85 outrage. Anybody with access to a wiring diagram? Also, does anyone know why a three way switch for the trim? How did it work? I have the 1985 merc 150 motor. Was the three way switch common? Any suggestions about modifications on the original wiring plan?

Thank you

triblet posted 04-24-2002 12:27 PM ET (US)     Profile for triblet  Send Email to triblet     
Trim is normally an SPDT center off switch.
Is that what you mean by "three way"?


whalertim posted 04-24-2002 01:04 PM ET (US)     Profile for whalertim  Send Email to whalertim     
Triblet is correct!
The trim switch is a SPDT switch, center being an off position. Up & down being momemtary positions.
JohnNorthEast posted 04-24-2002 01:04 PM ET (US)     Profile for JohnNorthEast  Send Email to JohnNorthEast     
Sorry for my lack of knowledge but the switch I have has three buttons. Iíve been able to get two to work, the center and the one outside button. These make the trim move slowly up or down.

The other button is not functional (but tests out OK from an electrical perspective). I do not under stand what SPDT means exactly. Iím a true novice at this. My thought was what is the purpose of three buttons to control a trim? Is the button, which is not working, supposed to serve as a ď fast upĒ button? Thanks.


Taylor posted 04-24-2002 01:52 PM ET (US)     Profile for Taylor  Send Email to Taylor     
Cooincidently I was just browsing in my Mercury book Sunday night (a little light bedtime reading) and I noticed that there were two types of trim units on 1980's Mercury motors. I don't know the exact dates or engines, but one type required only two buttons (up and down) while the other type required three (trim up, trim down and tilt).

Let me ramble on here and see if I can remember any more. Mine (1988 100HP) is the later style, requiring two buttons. These engines have two trim cylinders and one tilt cylinder. The other type uses three buttons and has two tilt/trim cylinders.

On the three button variety there is an electronic limit switch (on the engine) to stop the trim when it reaches a certain position, and the third button is used to bypass this limit switch electrically and when pushed along with the up switch serves to tilt the engine to the full up position.

On the later two button versions, this function is performed with some kind of hydraulic bypass valve and I think some black magic that allows tilting above the limit only when the engine is running below a certain speed and the phase of the moon is correct. I got tired at that point and went to sleep. ;)

So, you should have an down button, an up button and a tilt button which is required when you are moving the engine to or from the full up postion.

And, yes, there was a wiring diagram in the book which I could fax or photo and e-mail next week, if you have not found the answer by then.

SPDT is single pole, double throw. Single pole means that it controls one circuit, double throw means it can send the current out two ways.

JohnNorthEast posted 04-24-2002 02:06 PM ET (US)     Profile for JohnNorthEast  Send Email to JohnNorthEast     
Taylor, Thank you. Down up and tilt. Yep, I have the three button switch. This now makes sense as I was powering the switch from the battery directly ( as I have the floor off) and by passing the console wireing. I would greatly appreciate the diagram when you get the chance. I can email my phone/fax. Really appreciate your help
New at this


Taylor posted 04-24-2002 02:42 PM ET (US)     Profile for Taylor  Send Email to Taylor     
I'm new at this too. I really was just reading idly. Never thought I'd actually retain any of it! I've made a note to bring the book back with me after the weekend. Its in the back of the Seloc Merc manual that Dick recommended. Thanks Dick!

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