Test Lamp Troubleshooting
NOTE:
Refer to TEST PROBE NOTICE
in GM VEHICLES CAUTIONS & NOTICES article.
A test lamp can simply and quickly test a low impedance circuit for voltage.
The J 34142-B is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads.
To properly operate this tool use the following procedure.
- Attach one lead to ground.
- Touch the other lead to various points along the circuit where voltage should be present.
- When the bulb illuminates, there is voltage at the point being tested.