Charging System

There are several different types and brands of test equipment for checking alternators and regulators. Although all are designed to measure the voltage and current output of the charging system, their test methods may vary. Always follow the hook-up and operating instructions for the specific equipment that you are using.

Although most alternators and regulators are of the types described earlier and perform the same basic functions, design details and current connections will vary on different vehicles. The vehicle maker's test specifications and instructions are essential for accurate diagnosis. The following paragraphs contain important safety precautions, general oscilloscope test indications and the basic alternator checks.