Last week I bought my first boat. It is a 1969 mercruiser with a GM inline 4 rated at 120 horsepower. We took it out the first three days and had a blast, but on the 4th day out we would be going along and the trim would start moving up or down all by itself. I didn't think anything of it, but when we got back to load the boat, when I try to put the trim up to load it, the solenoid just clicks, and going down it is totally unresponsive. I read some of these posts and came to the conclusion that the solenoid was out, but I changed that yesterday and get the same results. Can someone please direct me where to start? If needed I can get the serial number off of the outdrive.