On-Vehicle Test Description

A voltmeter (0- to 20-volt scale), ohmmeter such as Rotunda Digital Volt-Ohm Meter 007-00001 or equivalent, jumper wire and a test lamp (12-volt) are the only tools required to perform on vehicle tests of the complete charging system. Test meter calibration should be checked once a year and the date of calibration stamped on the meter face. It is recommended that this practice be followed by all technicians to maintain their test meters at acceptable accuracy.

Troubleshooting or diagnosis is required before actual service can be made in the electrical system. Even where an obvious condition makes replacement of a unit necessary, find out why the unit failed. When a condition is diagnosed correctly, unnecessary service is prevented, the time the vehicle is out of service will be decreased, and the condition will be properly corrected the first time.