Lowrance LST-3800 Installation and Operation Manual - Page 4

LST 3800 housing LST black wire to buzzer black wire Buzzer red wire to boat power Buzzer Power/transducer cable Transducer Red to dash light switch Black wire Red wire and fuse 12 volt battery LST-3800 cable connections. In the configuration above, the unit is always on. It will draw 11 milliamps of current with the backlight off and 40 milliamps with the backlight on full brightness. Typically, the maximum recommended current load on a boat in storage is about 50 milliamps. A battery will self discharge at a rate of about 9 milliamps. A battery's normal discharge plus the gauge current (lights off) amounts to approximately 20 milliamps, well below the recommended load limit in storage. To automatically have the gauge backlights turn on when you turn on the other dashboard lights, connect the red dash light wire to the switch controlling the dash lights. If you want to turn off the gauge when your not using it, connect the red wire from the power/transducer cable to your boat's accessory switch, or install an optional switch between the unit and the power source. See the following figure. Power/transducer cable Black wire 12 volt battery Red wire and fuse Accessory switch This wire configuration lets you turn off the gauge when it's not in use. 4