91 fastrike GLEIS 150hp after replacing starter and getting ready for a tourney I went to put the transom saver on and hit the trim button and it moved extremely slow and sounded like I had a dead battery, thought I might have left something on so I put the charger on it but the battery was full. it is full of fluid and moves really slow and then sometimes on the way down is very jerky ,think the motor might be going out because I fished all day and had no problem starting the boat or running livewells and hds's so don't think it is a battery problem how can I check the motor?? also when watching the guage you can see it is not going up and down like it use too the guage is also kinda jerky in motion or eratic