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.
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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 531 (CHARGING SYSTEM)SYSTEM TESTSTEST D: GENERATOR NOISY
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Test D: Generator Noisy
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Test D: Generator Noisy
WARNING: This page is about a different car, the 2002 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
- Test generator for proper operation. See TEST A: CHARGING SYSTEM TEST . If generator is operating properly, go to next step. If generator is not operating properly, go to step 11 .
- Start engine. Verify that generator noise can be heard. Turn engine off. Disconnect 4-way connector from generator. Start engine. Listen for generator noise. If noise has stopped, go to step 11 . If noise is still present, go to next step.
- Turn engine off. Remove drive belt. Spin generator pulley by hand. If pulley rotates smoothly and no noise is present, go to next step. If pulley rotates roughly and/or noise is present, go to step 11 .
- Inspect pulley for looseness, or loose pulley nut. If pulley and nut are okay, go to next step. If pulley and/or nut is loose, go to step 11 .
- Loosen all generator mounting bolts. Tighten generator mounting bolts to specification. See TORQUE SPECIFICATIONS . Install drive belt. Start engine and listen for noise. If noise has decreased or stopped, system is okay. If noise is still present, go to next step.
- Check for stretched generator connections, or hoses or other equipment rubbing on generator. Go to next step.
- Reroute electrical connections, hoses, etc., away from generator. Start engine and listen for noises. If noise has decreased or stopped, system is okay. If noise is still present, go to next step.
- Check drive belt for proper tension. If drive belt is loose, go to next step. If drive belt is okay, go to step 10 .
- Replace drive belt tensioner. See appropriate ENGINE article in ENGINES. Start engine and listen for noise. If noise has decreased or stopped, system is okay. If noise is still present, go to step 11 .
- Check comparable vehicle for similar noise. If noise is present in similar vehicle, system is okay. If noise not present in similar vehicle, go to next step.
- If no definite generator problems were found, ensure all other possible sources of noise are eliminated. If all possibilities have been eliminated, replace generator. See GENERATOR under REMOVAL & INSTALLATION. Go to next step.
- Start engine and verify that noise is reduced or eliminated. If noise is still objectionable, go to step 2 .
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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.