Re: hot wires on tilt and trim
When wiring heats up it is an indication of internal corrosion and resistance. They need to be replaced. While you are at it replace/polish your connections.
If all wiring on the boat is of about the same age, your ignition wiring is likely on its way out. You can voltage drop test it to ensure there wont be a problem, and replace any wiring that is faulty. This is another area where clean tight connections is crucial.
Without checking this a future post of yours may be "My outboard wont turn over."