2001 Mercury Mariner 50-60HP Factory Service Manual, Page 148Get this manual
WIRING DIAGRAMS
Water Temperature Gauge
WIRING DIAGRAM Use this wiring diagram when using separate light switch for instrument lighting
aPURPLEConnect to Positive (+) 12 VoltLight Switch Wire12 VoltPosition Light Bulb to the Switched PositionBLACKConnect to Negative (-) GroundTANConnect to TAN lead located at the tachometer receptacle on Commander Side Mount Remote Control or TAN lead coming from Accessary IgnitionChoke Assembly
WIRING DIAGRAM Use this wiring diagram when instrument lighting is wired directly to the ignition key switch(Instrument lights are on when ignition key is turned on)