Mercruiser IO won't go down

K

kenorr61

Recruit
Joined
Jun 29, 2011
Messages
2
I have a 4.3 Mercruiser and the lower unit now suddenly won't go down. I hear it click by the motor but nothing moves. I have heard it maybe a relay switch or the solenoid. Can anyone help with diagnoising the problem.

Thank you
 
JWebber

JWebber

Petty Officer 2nd Class
Joined
Oct 21, 2008
Messages
137
Re: Mercruiser IO won't go down

I would start by checking for loose connections first. There is a process for testing the circiuts with a voltmeter and using a ohm setting in a service manual. Somebody here can give you a link for download of that section.
 
D

Doernuth

Petty Officer 1st Class
Joined
Jul 6, 2010
Messages
332
Re: Mercruiser IO won't go down

Cross the big terminals on the down soleniod with a screwdriver. If the drive goes down it is the solenoid.
 
bds85466

bds85466

Petty Officer 1st Class
Joined
Jun 11, 2007
Messages
375
Re: Mercruiser IO won't go down

Is the low limit switch somehow falsely triggered/stuck on?
 
D

Dryon

Petty Officer 3rd Class
Joined
Jul 31, 2007
Messages
86
Re: Mercruiser IO won't go down

Doernuth said:
Cross the big terminals on the down soleniod with a screwdriver.
Click to expand...

This might be okay on an auto solenoid, but I would never suggest doing this on a boat. Sparks & gas fumes don't mix well. There's only one way I would test the tilt-trim system and that is to check for 12v power & continuity per the shop manual instructions. Here is a quick check sheet I created. Wire colors may be different, but the general operation should be similar
 

Attachments

  • Troubleshoot Sterndrive Tilt-Trim Electrical Sytem.pdf
    26 KB · Views: 0
K

kenorr61

Recruit
Joined
Jun 29, 2011
Messages
2
Re: Mercruiser IO won't go down

Thank you for attaching the document. I will check it out this weekend.
 
You must log in or register to reply here.
Top