Re: tilt & Trim WORKINGS..
The Chryseler and Force two cylinder trim/tilt units all work the same.
Both cylinders are connected at the pump and both receive the same oil under the same pressure. Because the trim cylinder is a larger diameter it has much more area and therefore much more hydraulic advantage. So, when you hit the up switch, The pump delivers oil to both cylinders. Because the pump can only supply a fixed amount of oil at a fixed pressure, and because the trim cylinder is so much larger (therefore using much more oil to fill), it moves first and moves slowly. On the trailer, the tilt cylinder will act only after the tilt cylinder reaches its full travel. Then, since it has smaller area, since it has relief valves, and since it is attached differently, the engine tilts much faster than it trims. Because of the lower hydraulic advantage, the tilt cylinder can NOT move the engine under load say, at more than 1200 RPM in the water, however, under light load it behaves just like it will on the trailer.
The relays are simply high current switches to energise the motor in each direction. This keeps a low power signal voltage going through the dash switch. Since the pump motor is a DC motor, running voltage through it with positive on the blue wire and ground on the green wire, the motor will run in one direction and the trim/tilt unit will raise. Running positive voltage through the green wire and ground through the blue wire reverses direction and the unit goes down.
The relays are both defaulted to ground so when neither is activated, both blue and green are at ground. When you activate the up relay, it switches the blue wire from ground to positive voltage, the green wire is defaulted to ground, and thetrim/tilt unit rises. The other relay reverses the operation.
