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 MANUALSCHEVROLET1987BLAZER FULL SIZE V8-379 6.2L DSLREPAIR AND DIAGNOSISSTARTING AND CHARGINGCHARGING SYSTEMALTERNATORTESTING AND INSPECTIONBENCH TESTING
1987 Chevrolet Blazer Full Size V8-379 6.2L DSL
Bench Testing
1987 Chevrolet Blazer Full Size V8-379 6.2L DSLSECTION Bench Testing
Fig. 2 CS Alternator Bench Check:
1. Make connections as shown in Fig. 2, however leave the carbon pile disconnected. The ground polarity of the alternator and battery must be the same. The battery must be fully charged. Use a 30-500 ohm resistor between battery and L terminal.
2. Slowly increase alternator speed and observe voltage.
3. If voltage is uncontrolled and increases above 16 volts, the rotor field is shorted, the regulator is defective or both. A shorted rotor field can cause the regulator to become defective. Battery must be fully charged when making this test.
4. If voltage is below 16 volts, increase speed and adjust carbon pile obtain maximum amperage output. Maintain voltage above 13 volts.
5. If output is within 15 amps of rated output, alternator is satisfactory.
6. If output is not within 15 amps of rated output, alternator is defective and requires repair.
RENDER: 1.0x
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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.