Suzuki DF200/DF225/DF250 V6 4-Stroke Outboards Service Manual, Page 76Get this manual
ENGINE CONTROL SYSTEM
SUB BATTERY CABLE The ECM power source is through the gray lead wire which supplies power directly from the batteryThe white lead wire in the remote control extension harness carries battery power 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 ECMNOTE: Ensure battery cable connections are clean and secureFailure at the battery connection will cause incorrect operation of the ECM and starter motor cranking system