Honda BF15D BF20D Outboard Motors Shop Manual., Page 418Get this manual
D-GPS INSTALLATION PRECAUTION NOTE: Carefully follow the installation instruction when install D-GPS1Keep the D-GPS unit and antenna at least (10 ft) away from the outboard motor2Be sure to connect the ground system to the boat,
METER WIRE HARNESS CONNECTION Route and connect the wire harness properly as shown in the wiring diagramUse the genuine Honda wire harness and modify it if necessaryNOTE: Stake the lead wire against the terminal securely using the special toolUse the 1.25 dia(AWG #6) lead wire to put them togetherSolder the joint section and protect it by wrapping with piece of insulation tape
INSTALLATION