2006-2010 Suzuki DF150 / DF175 4-Stroke Outboards Service Manual, Page 72Get this manual
ENGINE CONTROL SYSTEM
SUB BATTERY CABLE (ECM POWER SOURCE LINE) The ECM is battery dependent and must be provided with its own dedicated 12V power supplyThe electrical circuits which provide this supply are: 1The sub battery cable to the white lead wire in the remote control extension harness to the ignition switchWhen the ignition switch is turned ON, battery power passes from the white lead wire, through the ignition switch contacts to the gray output lead wire to the No.23 terminal of ECMNOTE: Ensure battery cable connections are clean and secureFailure at the battery connection will cause incorrect operation of the ECM and starter motor cranking system2The engine wiring harness to the main relayWhen the ECM main relay is energized by turning the ignition switch ON, circuit is formed which supplies battery voltage to the No.20 terminal of ECM