Test-Lights

Non-Powered Test Light:

CIRCUIT POWERED TEST LIGHT
^ Uses vehicle battery or circuit voltage, to light the test lamp.
^ Used to check for power or ground.
^ Before using to test circuit, verify operation. Connect the clip to one battery terminal, and touch the probe to the other battery terminal, test lamp should light.

SELF-POWERED TEST LIGHT
^ Uses a small internal battery to light the test lamp. Lamp lights when continuity exists between the test probe and the clip.
^ Used to check circuit continuity, (circuit open or shorted).
^ Before using to test circuit, verify operation. Connect the clip to the test probe, test lamp should light.

CAUTION: DO NOT connect a self powered test light across a 12 volt circuit. This will burn out the bulb.

NOTE: Both types of test lights are commonly referred to as 12-Volt Test Lights.