kentucky_bill
New member
I have a 90 hp, 4 stroke mercury outboard on a Bennington Pontoon. At the end of last season my trim gauge started acting weird . It would start moving on its own when going down the lake. At the start of this season when I started the motor the light would come on in the guage and the needle would move to the far left of the gauge and would not move when I raised the engine. I made sure I had a good ground contact from the sender. I bought a new gauge and that did not fix the problem. I put the old gauge back on and removed the sender and readjusted it and got the gauge working in my garage. But when I put the boat in the water it did not work. I repeated this process 3 or 4 times. I then bought a new sender, installed and adjusted it. I took the boat to the lake and it worked good all day. The next day I decided to make a small adjustment to the gauge. I raised the motor and turned the ignition on. The needle was slowly moving to the half mark and then to the quarter mark, then settled in the correct position of where I had raised the motor to. I loosened the sender to adjust it and the needle went to the far left position and would not move regardless of what I did to move the sender. I don't know where to go from here.