how to bypass key switch with tilt/trim?

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whisker

Petty Officer 3rd Class
Joined
May 17, 2006
Messages
91
hi guys,
i have 87 merc 150. its off boat right now and im trying to check tilt/trim. i have access to a main harness where i can cross wires to see if they work. my question is on harness which wires do i need to touch or cross to test tilt/trim. thanks
 
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Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
28,129
Re: how to bypass key switch with tilt/trim?

That engine should have a three wire trim motor. Put some +12VDC on the blue wire and it will go up. Put some +12VDC on the green wire and it should trim down. You should have two solenoids to run the trim. Hook up a battery to the cables and use a clip lead to energize the solenoids.
 
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whisker

Petty Officer 3rd Class
Joined
May 17, 2006
Messages
91
Re: how to bypass key switch with tilt/trim?

so i can put 12 volts on green or blue wire where it connects to solenoid..
 
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whisker

Petty Officer 3rd Class
Joined
May 17, 2006
Messages
91
Re: how to bypass key switch with tilt/trim?

ok i got the motor on the pump to work it whines..i can hear it.. but nothing happens. when the motor was took off of the boat it was in up position.Now im having hard time getting it on my engine stand. I think maybe it needs some fluid. if it does can i put it in there being tilted. also does the tilt/trim have to have weight on it to function up or down. right now its on a shop crane.
 
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Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
28,129
Re: how to bypass key switch with tilt/trim?

PTT Fluid is added when the motor is tilted all the way up. Find the resvoir plug and with the motor level shoot some into it until it runs out. The weight of the motor helps the bleed process, so it would be best if you bolted it to a stand or the boat.
 
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whisker

Petty Officer 3rd Class
Joined
May 17, 2006
Messages
91
Re: how to bypass key switch with tilt/trim?

thats the thing. the outboard is at just a angle its almost impossible to but on engine stand. ive tried filling with fluid it runs but no movement. i tried manual release valve..nothing.. can i drain fluid and push down to lower outboard so i can install on stand. thanks
 
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Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
28,129
Re: how to bypass key switch with tilt/trim?

You can always remove the PTT unit from the motor, and put it on the bench to bleed and repair if necessary.
 
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