1994 Johnson/Evinrude Electric outboards Service Manual, Page 31Get this manual
Testing Procedures Battery All information necessary to evaluate the condition of the battery(s) and boat wiring is contained in Section 1, General Information
INote Provide
separate batteries for the electric outboardIf 1224 volt electric outboard and gasoline outboard must share battery, the gasoline outboard must be connected to the No.2 battery to avoid severe damage from electrolytic corrosionRefer to Battery Connections, Page 1-19Circuit Breaker12 Volt Hand Control Models
INote To avoid damaging components or troubleshooting equipment, disconnect the battery cables before proceeding1Remove the steering housing cover18