Mariner tilt relay
I suspect the relay for the tilt/trim motor on my Mariner 50 2-stroke (3 cylinder, circa 1993) may be on the way out ( as soon as the battery gets a bit low, the tilt will go up but not down; reverse the wires to the motor and it goes down not up; all the "small" wires to the switch and relay check out; charge the battery and it's OK - so I suspect a bad relay contact).
However searching for a replacement part always seems to come up with something looking like the starter solenoid, with large brass nuts onto screws taking the wiring, sold in pairs ( up/down). My boat has a single plain black box containing both relays, apparently a sealed unit, with all the wires in and out coming out through the casing, mounted on the left rear of the motor inside the cowling. No sign of any part number. Anybody know these units please and able to suggest a source ( pref secondhand if they are pricey) or at least a part number for it?