what you can do with the trim is take motor out and manually crank it to the center. ride it and fine tune it to where you want it. while motor is out you can check it on a battery or big charger. it is probably ok. it is usually the control box.
Thanks derek, I did pull the motor out yesterday and it was dead . I have a parts ski I robbed and checked the motor it works . But I dont think it was trying to move on the ski. The little plastic bushing had a crack and I think it is skipping over the nut now.