My manual tilt assist unit broke, and I found a second hand power tilt/trim unit online. My engine is a BJ50 BELEDS. The PTT is shown in the picture . Blue wire, green wire, black (earth wire). Is that classed as a 3 wire? Before I try to connect to the engine, how do I test the motor directly from a battery. (i've seen it work before, but can't remember which wires to touch to the battery leads). If it goes O.K. then I'll get help to connect it up. I don't see any relays on the engine. I do see an unused 3-wire harness and connector (blue, green and white wires). Can you direct me? I may go to a mechanic if things sound complicated.