Trim Control Power.

Ok, First off I would like to thank everyone for all the help so far. Your posts have been indespenisble in fixing some of my issues.

Boat is coming along nicely, in the mechanics department, haven't even begun to work on cosmestics yet. Anyways.......

Replaced the Solenoid on the Hydraulic pump. Got a wiring schematic for the Trim system. Everything looks connected correctly. Hit any of the three buttons on the dash and nothing happens. Battery is good and there is power going into new solenoid for hyrdaulic pump.

I was told if I crossed the blue or purple wire on the back of the switch with a power wire, the stern drive should move up or down depending on which wire I crossed with power. I crossed the blue (UP) with power and the solenoid made 1 click noise (this happened with 2 different solenoids). I crossed the purple (UP/OUT)wire with power and absolutley nothing happened, not even a click. I also tried with the green wire (IN) and got the same results as the purple wire, nothing. So far the only I can get out of the system is a single click from the selonoid when crossed the blue (UP) wire with power.

Any Ideas?

Also, what does a Normally Closed Reverse Inter-lock Switch do? This part is listed on the wiring schematic.

On Monday I will post a PDF file of the schematic in my gallery.

Thanks in advance

[macojoe]

well when my dash switch went I could not figure out how to fix it!!!
I ended up replacing it with a 2 switch model and it worked great!!

Hey purple wire!! Thats one by the motor you did not no were it went!!
They don't make two of them??

[Airslot]

If I can remember working on an older mercruiser...

The "normally open" desribes the type of switch. Most switches are either norm open or closed. The reverse inter-lock switch I believe cuts power to the trim unit when the shift linkage is engaged in reverse. You probably also have a shift-interupt switch which will cause you great joy at some point in the future. I kills the ignition system momentarily to make shifting easier. Until the switch fails or comes out of adjustment, at which time it just kills the ignition.

Airslot

[jaysea]

i beleave that switch is some kind of neutral saftey switch that will prevent engine from turning over or starting in gear with the key.its located by the cables by the excaust manifold on mine

This is a different purple wire, but they do seem to be popping up everywhere, lol.

So what do you guys think? I am about to replace the Hydraulic pump. I can't think of anything else it could be. All wires are connected and look good. Solenoid is new. Took the 3 button switch out of the equation by bypassing it. Still nothing but an occasional single click from the solenoid. Can't get the Stern drive to move up or down. Never get any noise from the pump?

[Mac_Attack]

Before you buy make sure there is voltage at the pump and that you have a good ground.

[macojoe]

YES YES YES Like Mac said!!get a good power to it and make sure it is DEAD!!!!
They are not going to be cheap and non sence buying one to find out it wasn't it!!

There is definitly good voltage going to it. I am not 100% positive about the groun though. Per the wiring schematic, I am positive that the wires are correct. The connections are also clean. The Thing that worries me is that when I took off the old solenoid and brought it to the shop to get a replacement, they gave me a Ford Starter Solenoid. It looks exactly the same as the old one.

I have the power going into the far right post, as originally down. Then a blue wire to the interlock switch out of the second post. The 3rd post is where the gound is connected, and the last post is power to the pump. The Soleniods middle 2 post are marked as such:
2nd post: "S"
3rd post: "I"

For some reason, I think that the ground should not be connected to "I". Though there is another ground wire that comes off of "I" and goes to the engine block. I just am not positive that the solenoid, even though is exzactly the same looking, is the correct one.

I post the pdf of the Wire schematic and there are pictures of the old solenoid posted.

[macojoe]

just take the power and ground wire from the pump and hook to battery.
See if the pump will run!!
If it works go from there.
If not then you will need a new one.
This way your not pulling your hair out for nothing!! It will never work if the pump is shot, no matter what you do!

MacoJoe is 100% correct. Isolate the probelm....Is the pump bad? Hot wire it and see if it works. From there you have a bunch of other decisions beyond this discussion.