This document provides general safety precautions for operating a specific circuit tester. It warns users to wear eye protection, avoid open flames near vehicles, and exercise extreme caution when working with high-voltage components like ignition coils and spark plugs.
The guide details various testing procedures supported by the device, including checking 9V batteries, measuring variable DC voltages, finding live wires in automotive circuits, and diagnosing spark plug ignition systems. It also includes instructions for testing household AC power outlets.
A good 9V battery shows both the 4V and 9V LEDs lit, while a bad or weak battery has the 4V LED off or dimly lit with the 9V LED off.
The device is designed to test variable DC voltages ranging from 4 volts to 15 volts.
You must never ground the black alligator clip while performing an AC voltage test.