View Full Version : HELP Replacing Throttle/Shifter In Donzi 18

06-27-2012, 07:57 PM
My Quicksilver single lever Throttle/Shifter is self-destructing! First had to super-glue plastic plate covering trim & trailer switches. Now the UP of the TRIM switch failed. Down Trim still works & I can trim up by using Trailer switch. Has anyone replaced the TRIM switch or do I need to replace whole Throttle/Shifter? Has anyone found a good reasonably priced replacement or must I do e-bay for original Quicksilver single lever? The experience on this site has been invaluable. Any solutions will be appreciated

06-27-2012, 09:10 PM
Posted on d.org today by me. If you want to see the rest of it go there.

http://www.donzi.net/forums/images/icons/icon1.png Trim.... Lack of...
A while back my pump was replaced. On the trailer it cycles up and down (fully) with ease. Underway it won't budge. I mean NUTHIN'. Boat is absolutely glued to the water. What gives? Anyone else have this issue? I'm dropping a Livorsi throttle in to replace the stock plastic throttle I have. I was hoping it's in the throttle somehow. New pump needed as well?

ralph crocker
06-27-2012, 09:29 PM
I believe you can get single levers from about $250 to $500 (Livorsi) with trim.
You can get a good replacement from Overtons as well. You will probably be getting rid of the trailer option. One switch will take it all up or all down. Good luck.

06-27-2012, 09:31 PM

06-27-2012, 09:43 PM
+1 on the Uflex they make a very nice unit, we sell just about every make some come back Uflex never does!

06-28-2012, 08:16 AM
I have installed a Livorsi/Uflex single lever shifter in my 22.

My only complaint is that there is no seperate button for trailer trim ala Mercury. The trim button on the shifter will bring the lower unit from negitive trim all the way to trailer.

Now if some nice guy can tell me what wires to cut, splice so I can install a seperate trailer trim button, that would be great.


07-05-2012, 12:23 PM
I bought an original mercruiser on e-bay. Looked good? Does anyone have experience replacing a throttle/shifter? Any clues of tricks?

07-05-2012, 02:20 PM
Not sure what model you are talking about, but if it is the 3000, for example, you have to get to the mounting bolts underneath the faceplate. Remove them and slide the unit away from its mounting. On the back, disconnect the throttle and shift cables and then disconnect the wiring at the bullet connectors. Then reverse it to re-install.

It is not very hard.

Some photos of your shifter would help to narrow down the instructions as I am sure each shifter is slightly different.


07-05-2012, 04:09 PM
For those of you that want a seperate trailer switch on your panel (or anywhere, for that matter), take a look at this scan of the trim schematic from an old manual I have. (I think everyone should have a manual for their drive trains).
OK, on the left side of the page you can see the connectors and wiring that go through the limit switch in the gimbal assembly.
Notice connector #15 has two blue-white wires coming from the "boat" side of the connector. If you trace backwards through the three pin connector (#13), it terminated at the "UP" solenoid. Also notice one of the two blue-white wires goes through the limit switch and becomes a purple-white wire that goes through the old Merc trim panel. In the modern world, the purple-white wire would be wired through the throttle mounted trim switch to the red-purple wire which will stop the trim action at the limit of the limit switch.
The other blue-white wire would be wired through your new trailer switch and the other side of that circuit is wired back to the red-purple wire utilizing a 20 amp in-line fuse.
Remember, the power for everything, including these switches comes from that 20 amp circuit breaker visible at the top central part of the schematic.

07-06-2012, 07:00 AM
Thank you Mr.Carter.


09-03-2012, 08:03 PM
Replaced the trim switch and trailer switch only purchased on ebay, but still wouldn't trim up. Would trim down and only way to raise lower unit was still to use trailer switch for up. Well thanks to George Carters schematic could trace purple/wht wire to purple wire connection to the trim limit switch where the real culprit was = corroded connection. And 2 blue/wht to blue wire connection is there too. Thanks George! Everything works now and the ebay throttle/shifter parts work better too! Only thing was I could never locate the trim limit switch (on transom?) even though I tried to follow the blue wire and purple wire (mine are both black) and still couldn't find trim limit switch! Anyone know where the trim limit switch is??? Fixed but still curious, Bob

09-04-2012, 11:25 AM
Trim limit switch is on the port side of the gimbal ring.
I don't have mine hooked up at all. I know where my limit is!

09-04-2012, 11:30 AM
Sounds to me as if the high pressure side of pump has been reversed somehow.
Were the trim hoses going to rams replaced as well as pump?
If so, perhaps the hoses were installed in the wrong fittings?
On the rams, the short hose on top of the forward part of the ram, goes to the forward fitting on the trim hose manifold. If it's not, like I did once, you wont' get high pressure to trim up.
This sounds like a 2 fold problem.
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