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Mercury 40 FourStroke - QSI Gauge Wiring Diagrams; Tachometer Wiring Diagram

Mercury 40 FourStroke
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WIRING DIAGRAMS
90-857046R1 NOVEMBER 2001 Page 2D-13
QSI Gauge Wiring Diagrams
Tachometer Wiring Diagram
Tachometer dial on back side of case must be set to position number 4.
WIRING DIAGRAM A
Use this wiring diagram when using a separate light switch for instrument lighting.
51106
c
b
e
d
a
a-PURPLE or WHITE - Connect to Positive (+) 12 Volt
b-Light Switch Wire - 12 Volt
c-Position Light Bulb to the Switched Position
d-BLACK - Connect to Negative (-) Ground
e-GRAY or BROWN Wire
WIRING DIAGRAM B
Use this wiring diagram when instrument lighting is wired directly to the ignition key switch.
(Instrument lights are on when ignition key switch is turned on.)
51106
b
d
c
a
a-PURPLE or WHITE - Connect to Positive (+) 12 Volt
b-Position Light Bulb to the Unswitched Position
c-BLACK - Connect to Negative (-) Ground
d-GRAY or BROWN Wire

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