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Northstar M121/M84 Installation and Operation Manual94
Black
Auto power
When wired for Auto Power On the unit will turn on when the ignition switch is on, if you would like
the unit to turn off when the ignition switch is off then set the unit for Auto Power Off (see section
2-2 and 17-1)
2 Wire any external alarm beepers or lights. The alarm output switches to ground to sound the
alarm. If the current is more than 200 mA, fit a relay.
3 Connect the power/data cable to the black display unit connector; turn the collar to lock the
connector.
Power/data cable
Yellow
Red
Black
Ignition
Ignition switch
Main switch
12/24 V DC
Fuses 2A
Power/data cable
Red
Yellow
Black
20-4 Installation: Power/data cable
Main switch
12/24 V DC
Fuse 2A
The power/data cable has a black locking collar and flying leads.
1 Wire the Instrument for auto power to have the Instrument turn on with the boat’s ignition switch
or to record engine hours or if the Instrument must add up the total fuel used (for example if
Northstar petrol/gasoline fuel sensors are installed or if SmartCraft is installed without fuel tank
level sensors). Otherwise wire for basic power (for more information, see section 2-2).
Basic power
Black
Black
External beepers or
lights
Power/data cable
Red
Green