Isolating the Problem

Battery, starting system, and lamp system problems can be caused by poor charging system performance. It is also possible to suspect the charging system if an overload condition has occurred in another area of the electrical system.

To avoid guesswork, it is necessary to isolate battery, charging system, and electrical circuits to correctly identify the area where the difficulty lies. Check the battery first before beginning any electrical system diagnosis. The battery must be in a proper state of charge. The battery must be operating properly before the other areas of the electrical system can perform normally.