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Author Topic:   omc throttle trim switch troubleshoot
Cpt Quint posted 02-09-2004 11:13 AM ET (US)   Profile for Cpt Quint   Send Email to Cpt Quint  
trim button on throttle works going down but not up. trim does go up with switch on the motor. I suspect the problem to be in the morse control. Can that be disassembled to investigate the connections, or would I have to get a whole new morse control unit. any troubleshooter ideas welcome
Eagleman posted 02-09-2004 01:09 PM ET (US)     Profile for Eagleman  Send Email to Eagleman     
If the tilt works off the engine switch, your trim motor is operating. Problem could be a corroded switch contact points in the trim switch or a broken wire lead. Take the switch apart and take a look, nothing ventured nothing gained.
Good luck
triblet posted 02-09-2004 10:02 PM ET (US)     Profile for triblet  Send Email to triblet     
I've gone through two switches. One was the switch itself,
failed CLOSED, ran the battery dead flat sometime midweek
trying to jack the transom off the trailer, the other was
a wiring abrasion inside the control. This was on an OMC
control, not a Morse. I saved the wiring off the last one
and will rig a switch on the console next time.

At least with mine, you could unplug the socket under
the control, and jumper in the socket. If the jumpers
move the motor, it's the switch.

What OMC motor? and is it an OMC harness, in which case
I might be able to help you with what to jumper to what
to test it.


bothedog posted 02-13-2004 11:51 PM ET (US)     Profile for bothedog  Send Email to bothedog     
Ran into the exact same problem this summer. Checked the connection and found the problem was in the box containing the wires and other "stuff" on top of the motor (apologies in advance - not an expert description) under the cowling (obviously) where the wires from the control pass through. Cleaned the contacts in this area and took care of problem.

Found this simply with a snap-on electrical tester (pin point screwdriver thing-a-ma-bob with the alligator clip... apologies again). Track the wires and make sure you determine where the compromise is before thinking it is strictly the control switch.

Johnson 70 hp 3 cyl w/ morse control

where2 posted 02-19-2004 01:10 PM ET (US)     Profile for where2  Send Email to where2     
Since trim on engine works, then check wiring to morse and back. I've heard problems with relays, with wiring, and Triblet's faulty switch. Start at the relays and follow the wires toward the console...

Triblet's right, we've got OMC wiring diagrams... Morse will be "more fun", but not "impossible".

Eagleman has it right: Take switch apart and look. It was broken when you started messing with it... Maybe it's still fixable.

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