Re: Forward power trim switch
Hi Mark and thanks for your reply and checking this out on your boat. Looks like my wiring is 3 wires, green, blue and purple and either travels through the throttle box or is wired into it before proceeding to motor. I have 3 wires that are green, purple and blue...same color as those coming from the throttle box. Suspect if there is a fuse that it is in line since it does not go through my fuse panel. I can take out front glove box and see in upper bow. Maybe I can find a fuse there. Thanks again for looking and responding.
Chris
Normally inline fuses are placed where they are readily accessible. Under the dash is a prime spot for OEM boatbuilders who don't incorporate a fuse panel in a convenient location.
I just had a look at the wiring diagram for the Merc Commander 2000 side mount control. I have a 3000 in my boat, but it is not covered in the service manual for my engine; just the 2000. The difference in the two is that the 2000 mounts on the (inboard vertical) side of the gunwale and the 3000 mounts in it, requiring you to depress a large black button to initiate fast idle, unlike the 2000 which has a lift lever at the rear.
Power to the remote wiring harness is a red wire coming off the starter solenoid (on the starboard side of the block near the starter) small red wire. As soon as it leaves that terminal (junction) it incorporates a 20 amp fuse....on my engine the fuse is within 6" of the starter solenoid. The output of the fuse is power to the remote cable plug which connects to everything forward. So, unless you have an aftermarket somewhere else on your boat, there is your fuse. However, if it were to blow it would (should) knock out all Merc engine gauges and anything forward requiring 12v to operate that is associated with the engine, including cranking and choke function.
Power inputs changes from red to purple (colored wires) at the ignition switch and purple is used in some places for power along with red. I do now know the distinction between the two colors...possibly purple is only hot when the ig sw is on or in acc position.
The blue and green wiring is between the engine connector and the switch on the throttle/shift lever. I found no external connection for forward mounting a trim switch, however, I did find a "tach/accessory" plug with a pin that is used for boats with a trim position indicator....like an I/O would have as one of the possible accessories.
Therefore, it is my opinion that your OEM boat mfgr broke into the wiring between the remote control connector and the actual remote box where he picked up the purple, green, and blue wires and probably there is no additional fuse.
The 12v supply in the wiring in my boat is not engine associated and therefore was fused separately. It runs nav lights, a forward night light, a depth finder, and the forward TT switch.
Best I can do.
Mark