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.
Test 3
Connect the voltmeter between battery positive terminal and high tension coil negative terminal, the voltmeter should register zero volts. See Fig 1 . Switch the ignition ON, the voltmeter should still register zero volts. Crank the engine, the voltmeter reading should increase when cranking, in which case proceed to TEST 5 . If there is no increase in voltage during cranking proceed to TEST 4 .
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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.