Sounds like you've got local help, but there's lots of simple stuff like checking connections, switches and grounds before concluding it's the motor.
On my Mariner (50 hp 2 stroke) the wires to the tilt motor aren't grounded ( they just switch polarity for up/down), so if yours is the same you can test the motor just by CAREFULLy running cables from the battery positive and negative (in fact I used one of those car jump starters with its own battery) direct to the wires going into the motor ( use the connectors for those wires under the cowl), bypassing all the other circuitry. Then if your motor runs fine it's time to start checking earths, switches, etc. If the motor doesn't run of course then you've found the problem!
But a problem like this after a long layup sounds like a grotty connection somewhere...