Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Theory Of Operation
The purpose of the following procedure is to demonstrate how to check the operation of a generic ground circuit with a test light.
The circuit shown is an example, and is intended for demonstrational purpose only.
The following are circuit tests covered in this procedure:
- Testing Ground Circuit With Test Light
Perform the following test using a known good test light.
| Possible Causes |
|---|
| OPEN GROUND CIRCUIT (CHAFED, PIERCED, PINCHED OR BROKEN WIRE) |
| OPEN IN-LINE CONNECTOR (BENT, PUSHED OUT OR CORRODED TERMINALS) |
NO RELATED
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.