1969 mercruiser 120 tilt/trim just clicks

[Newboater1969mercruiser]

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.

[Howard Sterndrive]

trimming up and down by itself - I would say you have some serious wiring harness issues. Corrosion making a short circuit.

[Newboater1969mercruiser]

today I took the solenoid off again, and cleaned all connections. Where the wiring harness plugs into the pump( pretty much an all rubber connection) I notice that the female side which is on the pump itself looks a little melted I don't believe this is normal so I am now looking for a wiring harness for this. It is a 3 prong, and all I can find look like they have about 7-10 prongs that are round, not the 3 flat prongs in kind of a triangle pattern. Does anyone know a part number that I need and where I can find one. I am going to take this boat to a mechanics shop tomorrow and see if they can give me an estimate, but I would like to maybe buy parts myself to save a little cash and see if I can replace them myself. thank you

[bandit 1989]

hi am new to this just bought glastron with mercruiser 3.0 alpha 1 outdrive my trailer button does nothing ?
but my up button will raise the outdrive all the way up to the trailer postion ?........when it works!! usually just get click click and no movement ??
down works spot on any help on this would be greatly apreciated as its destroying my quality of life
ps. sorry for not starting my own post it wont seem to let me

cheers