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.
Load Testing A Ground Circuit
DIAGNOSTIC LOAD TEST (GROUND CIRCUIT)
- multimedia:A supplement to the article is available.
- Disconnect the connector from the device(s) to gain access and isolate the terminal for the circuit being tested.
- Connect the positive lead of the load test tool to the positive side of the Battery.
- Using an approved connector back probe tool, connect the negative lead of the load test tool to the ground circuit at the component harness connector (A). Note:
refer to the diagram above.NOTE:
The bulb on the load test tool should be illuminated and bright if there is no resistance in the ground circuit.
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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.
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