i have a 150 mercury and the trim will not work. i thought it might be a wiring problem but it all checked out. the trim switch on the motor works fine but the one at the steering wheel and the one at the front of the boat will only trim down. it just started doing this and i have never had one do this before. its hard to figure out because when i have it out of the water all the trims seem to work most of the time. any help at all would be great. thank you.