1979 Mercury 80hp Trim and Tilt not trailering

[submarinesonce772]

I have a 1979 Mercury 80 with 2 cylinder trim and tilt and 3 buttons on the boat dashboard. (not on the merc controller). The guy I bought it from said that everything worked but it has been sitting for at least 5 years probably closer to 8 judging by registration and condition. The buttons are labeled up, up/out, down/in. The "up" button does nothing. the "down/in" works as it should. but the up/out button will only go to the up position. it does not go all the way up to trailer position. I have filled the pump with oil and purged the air but I don't think it is a pump issue because the motor actually shuts off when it reached the "up" position. I'm thinking it might have something to do with the "limit switch" but I do not know where it is on this early unit. any help with why the up button doesn't work or whats going on is appreciated. Thank you

 

[Chris1956]

Those PTT controls work this way. Push center button to trim motor up. Push center and top button together to tilt the motor. Push bottom button to trim down.