Trim Continues Running After Releasing Button

tystick44

Recruit
Joined
Jun 16, 2022
Messages
2
After hours upon hours of research, it appears no one else has had this problem. I own a 1979 classic Mercruiser stern drive handed down to me from my pop. We like to call it vintage. On our last adventure with this beaut the up trim continues to run after releasing the button. It does not do this with the down trim. This is what I've tried thus far:
1) To stop it, we disconnect the negative and when reconnecting it's not longer initiated
2) Checked the fluid level and it's good
3) Checked all connections at the trim motor (not within the control lever)
4) Hit up and pulled the 3-prong plug at the trim motor and it still continued to go up after pulling the plug, which makes me think that it's not the switch on the control arm (correct? or no?)
5) Tapping on the solenoid while trimming up

I'd appreciate any advice from anyone willing to share their experience/expertise. Thanks in advance!
 
Last edited:

dingbat

Supreme Mariner
Joined
Nov 20, 2001
Messages
16,505
Pull the wires off the switch.
Using a meter, check for a change in continuity (open/close) while actuating the switch.
 

Scott Danforth

Grumpy Vintage Moderator still playing with boats
Staff member
Joined
Jul 23, 2011
Messages
50,770
there is no arc suppression on the relays. after a while the contacts can weld themselves

easy to check.

Do you know if there is a way to test the switch specifically?
use a test light or a DVM

4) Hit up and pulled the 3-prong plug at the trim motor and it still continued to go up after pulling the plug, which makes me think that it's not the switch on the control arm (correct? or no?)
this says you need new relays
 
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