1978 Johnson 175, 200, 235 HP Outboard Service Manual, Page 141Get this manual
DESCRIPTION The complete electrical system is made up of the ignition system, the starter system, the alternator charging system, and the storage batteryAlso included are the instrument and cable group at end of Section 9This section will cover the starter system and the charging system, and battery maintenance
Check the electrolyte level in each cellIf electrolyte level is below the plates, it is possible the battery is permanently damagedAlso look for dirt, oil or other contaminants floating in the electrolyte
SAFETY WARNING