Straight electric shift unit. My replies corrected.
In that type lower unit, you must absolutely use what is called "Type C', also called "Premium Blend". You CANNOT use the lube that is used in standard mechanic shift engines (HiVis). Available at your dealership... I have also seen it on the shelf in Wal*Mart at a considerably lower price... it will be marked as "For Electric Shift" on the container.
NOTE: Fill from the bottom Drain Screw (large slotted screw) until the fluid flows out of the top oil level screw (Identical slotted screw).
To find out if the lower unit is okay.... with the ignition switch in the ON position and the shift switch applying voltage (12v), connect temporarily that wire to one of the lower unit wires... the prop should turn in one direction and lock up solid in the other direction. Connecting the voltage wire to the other lower unit wire should do the same in the opposite direction.
The above test should show you which harness wire goes to what lower unit wire.
The voltage registered at the harness to lower unit connection should be battery voltage (12v). If a voltage drop exists, that normally indicates a faulty shift switch, loose connection, something of that sort. Which wire(s) show that voltage of course depends on the position of the shift switch.
