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Description of the 2-wire tilt mechanism:
It consists of:
*- A key switch fed from a fuse panel (not represented in the drawing). The key switch feeds the warning lamp and the up-down switch.
*- A warning lamp. This lamp is supposed to be lit at all times, except when the outdrive is fully down.
*- An up-down switch. Contact 2 is common. Contact 1 is up, and contact 3 is down.
*- A 3-wire connector (blue, green/yellow, and brown wires) to connect the tilt mechanism to the warning light and the up down switch.
*- Two relays. The one at the right of the drawing (to which the brown wire coming from the up-down switch goes) is the “down” relay; and the one at the left side of the drawing (to which the blue wire coming from the up-down switch goes) is the “up” relay. On each relay, the coil is represented between the terminals 85 and 86. Once the coil of a relay is energized, the contact between terminals 30 and 87 (represented below the coil) is closed. The micro switch on top of the mechanism is actuated by the push rod from the retaining pawl. The contact connects terminals 1 and 2 when the outdrive is not fully down. When the outdrive is fully down, the push rod switches the contact to open (1-4) position.
*- A 2-wire connector (black and brown wires) to connect the relay box on top of the tilt mechanism to the electric motor.
*- An electric motor with 2 wires: the brown wire, which send the “down” signal; and the black wire, which sends the “up” signal. The power for the “up” or “down” signals is taken from a wire coming from the engine starter and sent to the electric motor via the relevant relay.
Here is how it works:
By turning the key switch “on”, power reaches the up-down switch and also the warning light. If the up-down switch is not operated, no power reaches either of the relays’ coils. The power going to the warning light will make it lit if the outdrive is not completely down, as the micro-switch will close the circuit between the warning light (yellow – yellow/green wires) and engine block ground (via the black wire). If the outdrive is down, the light will be off, as the micro-switch will be open and the continuity between the light and ground will therefore be interrupted.
If we turn the up-down switch to “down”, the following will happen: 1) The contact will close between 2 and 3, and power will reach the terminal 85 of the “down” relay (right side) via the brown wire. The terminal 86 and the terminal 2 in the micro switch are connected by the yellow wire. If the outdrive is not fully in the down position (which we will know because the warning light will be “on”), then there will be continuity between terminal 86 of the relay and ground, which means the relay’s coil will be energized. 2) Once the relay coil is energized, the contact between terminals 30 and 87 will close. 3) Power from the + wire coming from the engine starter will go through the red wire via the contact between 87-30 to the motor via the brown wire. 4) The black wire in the motor will be connected to ground via the contact between the terminals 30 and 87a on the “up” relay and the black wire going from the terminal 87a to ground (the relay coil is de-energized, so the contact is in the normally open position). Therefore, the motor should start turning and lowering the outdrive until it reaches its lowest position, at which point the micro-switch contact will pass from the NC to the NO position and the circuits for the relay coil and the warning light will be interrupted. This means that the light will be off and the electric motor will stop even if you keep pushing the up-down switch into the “down” position.
Now, if we turn the up-down switch to the “up” position, the following will happen: 1) The contact will close between 2 and 1, and power will reach the terminal 86 of the “up relay (left side) via the blue wire. The coil will then be energized, because the other side of the coil is connected to ground via the black wire going from 85 and 87a to ground. 2) Once the relay’s coil is energized, the relay contact will switch from 30-87a to 30-87; 3) Power from the + wire coming from the engine starter will go through the black wire via the contact between 87-30 to the motor via the black wire. 4) The motor should then start turning the opposite way as for lowering, and lifting the outdrive until it reaches its highest position. The brown wire from the motor goes now to ground via the contacts 30 and 87 of the “low” relay at the right side (the relay coil is de-energized, so the circuit between 30 and 87a is now closed).
There is no micro-switch to stop the motor once the outdrive is in its highest position. Even if it is not represented in the drawing, it is common practice to install (as a safety measure to avoid frying the motor) an overload thermal fuse in the wire supplying power to the motor from the starter. That thermal fuse will interrupt the circuit in case we keep trying to lift the outdrive after it has reached its highest position and the motor is now becoming stalled."
