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.
Component Tests: Notes
Battery - Load Test
- With the engine running, turn the A/C on, the blower motor on high speed and the headlamps on high beam.
- Increase the engine speed to approximately 2,000 RPM. The voltage should increase a minimum of 0.5 volt above the base voltage.
- If the voltage does not increase as specified, carry out GENERATOR ON-VEHICLE TESTS .
- If the voltage increases as specified, the charging system is operating normally.
Battery - Drain Tests
NOTE:- No production vehicle should have more than a 50 mA (0.050 amp) continuous draw.
Check for current drains on the battery in excess of 50 milliampere (0.050 amp) with all the electrical accessories off and the vehicle at rest. Current drains can be tested with the following procedure:
WARNING:- Do not attempt this test on a lead-acid battery that has recently been recharged. Explosive gases can cause personal injury.
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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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