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Unexpected trim

L

lgenz

New member
I have an 06 merc 60 hp on an 06 tracker. When I turn ignition key on the motor starts trimming up. Only stops when key is turned off.
 
Locate the trim relays and swap them. If the problem follows that swap, time for a new relay. If you can't figure out which one is bad, just insert the new one in the swapping process until problem disappears. If you swap and nothing changes, then remove the back side of the control handle, exposing the trim switch. Swap outer wires and see if it changes the direction....if so, switch is bad. If that doesn't locate it, open the control and check for a chafed wire therein. I expect that Merc. uses the same color code on multiple engines. The blue wire is like the sky and is the UP command whereas the green wire is like grass and is the DOWN command.
 
The trim works fine, up and down, when I use the shift lever tilt button. Also works fine when using the trim button on the motor itself. Only when I turn dash ignition key to on, the tilt activates up. wondering if key ignition went bad.
 
In looking at the Commander 2000 remote control wiring harness, raw 12v from the 20 amp fuse in the engine is fed to the Power Control switch on the solid RED wire. That switch is not connected to the PTT circuitry except for both getting input 12V from the same source (RED wire) which is available any time the remote control cable is plugged into the engine, and thus allows you to have PTT any time, regardless of power switch position.

Prior to reaching that switch, the RED wire is pigtailed with the center pin of the tilt/trim switch giving you the convenience of running the PTT anytime from any place in the boat that has access to the BLUE, GREEN, and RED wires. Since you said everything works fine in the OFF position, it means that all your PTT components are fine. Interesting problem.

In thinking through this, the PURPLE or RED/PURPLE STRIPE wire is "switched 12v" which occurs when the switch is in the ON, or START positions. As I see it, probably in the control box, some chafing has occurred whereby that wire and the BLUE PTT wires are making contact. Could also be a chafe point somewhere in the routing of the control cable from the engine to the remote control.

Disconnect the remote wiring harness plug in the engine compartment. Looking into the remote harness connector get on PIN 2, the PURPLE (or may be the RED/PURPLE STRIPE......the "switched 12v" line) wire with an Ohm meter and set it to the 200 Ohm or a low Ohmic value with the other lead (clip on an extension wire to get the required distance) and go to the PTT switch in the RC handle and get on the BLUE wire on the back of that switch.

With the switch OFF you should have an open circuit. Switch to the ON position and see if you read continuity. If so, the switched 12v is shorted to the BLUE wire somewhere in the wiring harness or control box (probably since the moving of the control stick moves things around inside the box where the wiring is located and shorts do happen in there. I don't know what else it could be.
Good Luck!
 
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