Re: Will an johnson 150 1989 tilt/trim unit work on a 78 evinrude 115
Your problem will be electrically. The early unit is a 3-wire motor/system which functions with a special electrical box that mounts under the splashwell of the boat and has a single solenoid in the circuit. The newer unit is a two-wire motor/system. That uses a box which mounts to the exhaust manifold of the powerhead (they are drilled to take the box,) and uses two internal solenoids. Not any electronic compatibility between the two systems when mixing parts between the two systems.