Have any of you guys had trouble with your opti's blowing a fuse in the motor when using the tilit trim? I had it to the dealer last week and he could'nt find anything wrong. It blew three times today on the lake when sitting down and trimming up. Now, on the trailer I can't get it to blow? Anyone had this problem? Thanks for any help

I happen to have a Mercury service tech sitting next to me having lunch. He suggests pulling the connections apart, and looking for corrosuion on the pins, or a bad wire to pin/socket crimp. Otherwise, you may need to have the tilt/trim motor serviced. If yours is a '06, it might still be under warranty.
HRG

I had what might be a similar problem on my 135 Opti a couple years ago. It ended up being the wiring harness that goes to the trim sensor. It had gotten pinched and when I would trim the motor while in the water and moving it would short out and blow a 20amp fuse under the cowl. Like yours, it never caused an issue when not in the water. I replaced the wiring harness and tied it up so the hydraulic cylinder couldn't pinch it this time and no problems since. Drove me nuts for a long time!!

Would that kill your engine when that would happen......sounds like maybe this could be my problem. There is a wire slight pinched by the hydraulics going to what could be a relay mounted on the engine bracket. This problem is driving me crazy. Thanks for the info.

Absolutely kills the engine, and it won't even turn over until you replace the fuse when it blows. That sounds like where mine was pinched as well. Temporarily I cut / peeled back the casing for the harness and coated the wires with liquid tape to resolve the issue while I got the new harness. What you're calling a relay is actually a sensor that sends the tilt/trim level to the Smartcraft guage. Be prepared, if I remember right that silly little wiring harness / sensor is about $85.

I know what you mean about driving you crazy, it was giving me fits for quite a while.. PS, when you put the new harness in make sure that the wires are tied up so that the cylinder can't pinch them again. I've had zero problems with mine since then.