Mercruiser trim up and trailer up non functional.

[msd58]

Saturday I had temporary no up trim or trailer up button. It resolved it's self Saturday for rest of weekend. (I do have trim down and trailer down.) Today same thing. No trim up and no trailer up function. No clicks from up solenoid to so I replaced up solenoid. Still no trim up or up trailer function. No click from up solenoid. Only the down function solenoid clicks.

 

[ratdude747]

Saturday I had temporary no up trim or trailer up button. It resolved it's self Saturday for rest of weekend. (I do have trim down and trailer down.) Today same thing. No trim up and no trailer up function. No clicks from up solenoid to so I replaced up solenoid. Still no trim up or up trailer function. No click from up solenoid. Only the down function solenoid clicks.

Did you check the switches and wiring?

Granted, my Mercruiser is old (1976 MC-1), but at least on it, the trim up switch is used for both functions (the override switch merely jumpers/bypasses the trim limit switch on the outdrive to allow trailering). No noise and a presumably good solenoid makes me think you're not getting power/ground to the solenoid.

 

[CayugaCobalt]

Saturday I had temporary no up trim or trailer up button. It resolved it's self Saturday for rest of weekend. (I do have trim down and trailer down.) Today same thing. No trim up and no trailer up function. No clicks from up solenoid to so I replaced up solenoid. Still no trim up or up trailer function. No click from up solenoid. Only the down function solenoid clicks.

Could be busted wire inside shift handle. My up button never worked but I thought that was because I had a busted wire on the sender down near the bellows. But with new sender, same issue, up button alone does not work and read online here that the Quicksilver 3000 shifter I have is known to develop a broken wire inside the handle. I have two new solenoids.

 

[Kola16]

Well I wouldn't just start replacing parts willy nilly. That gets expensive. Don't ask how I know
You need a multimeter. A decent one can be had for $15 and it is a must for boats. You will want alligator clip leads too. First do a continuity test or resistance test between the ground wire on your trim pump and your batteries ground, or grounding bus bar. You should have continuity. Or your ohms reading should be less than 1 ohm. Then do a continuity test or resistance test between the solenoid ground and your battery's ground/grounding bus. The ground for your solenoid and trim pump may be the same wire. If you do not have continuity, or your resistance reading is greater than 1 ohm, your ground is your problem.

If you have a good ground, then switch the multimeter to voltage. Take the multimeter leads and put one on the ground and one on the blue wire on the solenoid. Hit the trim up button on your switch. Are you getting at least 12v? If not, you are not getting a signal to your solenoid from your switch. So you will have to follow that wire back.

 

[Scott06]

Saturday I had temporary no up trim or trailer up button. It resolved it's self Saturday for rest of weekend. (I do have trim down and trailer down.) Today same thing. No trim up and no trailer up function. No clicks from up solenoid to so I replaced up solenoid. Still no trim up or up trailer function. No click from up solenoid. Only the down function solenoid clicks.

I think the key is determining if you are getting 12 v to the up solenoid when toggling the trim and or trailer button. based on what you outline I would think intermittently you are not getting the 12 v to fire the solenoid.

To test you could jumper 12 v directly to the solenoid where 12 v from the switch is supposed to be.

 

[nola mike]

Just for funsies what are we working on?

 

[msd58]

I think the key is determining if you are getting 12 v to the up solenoid when toggling the trim and or trailer button. based on what you outline I would think intermittently you are not getting the 12 v to fire the solenoid.

To test you could jumper 12 v directly to the solenoid where 12 v from the switch is supposed to be.

I found this posted by the late great Don S

 

[msd58]

I think the key is determining if you are getting 12 v to the up solenoid when toggling the trim and or trailer button. based on what you outline I would think intermittently you are not getting the 12 v to fire the solenoid.

To test you could jumper 12 v directly to the solenoid where 12 v from the switch is supposed to be.

Tested the up solenoid connections with test light. No 12v when operating trim up and trailer up buttons. Checked fuse and main plug coming into pump from mm J

 

[msd58]

Ordered a new trim switch assembly

 

[Scott06]

Ordered a new trim switch assembly

Would agree if no 12 v coming from switch to solenoid That it’s the switch. Hopefully it’s not too hard to get to in controller

 

[msd58]

Would agree if no 12 v coming from switch to solenoid That it’s the switch. Hopefully it’s not too hard to get to in controller

Downloaded the instructions from Mercruiser. Seems pretty straight forward. Remove handle, disassemble, remove old switch assembly. There is plug where the wires are attached.