Rear window defroster switch causing discharge in electrical system/

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I just replaced the alternator in my 2001 Blazer LT and sitting idle at a stoplight for example, turning on the rear window defroster switch causes a massive electrical drain in the system. It drops from just over 14V to around 9V or so. This only happens at idle speed settings though.

kpilot in Anchorage AK

Apr 2, 2016

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RepairPal Certified shops can diagnose and repair your 2001 Chevrolet Blazer. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.

2001 Chevrolet Blazer auto repair 2001 Chevrolet Blazer estimates 2001 Chevrolet Blazer questions 2001 Chevrolet Blazer problems 2001 Chevrolet Blazer recalls

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Rear window defroster switch causing discharge in electrical system/

What is your question?

kpilot in Anchorage AK

Apr 2, 2016

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pushrodon Apr 2, 2016

'IF'that were the case.. It would be blowing fuses!! .. More likely alternator is failing and any other load that's put on it will show a discharge .. Turn on high beam headlights lights .. heater on high then step on brake pedal and watch voltage guage .. at idle..

kpiloton Apr 2, 2016

I just replaced the alternator and it's not blowing fuses. Having this problem with a brand new alternator.....

pushrodon Apr 2, 2016

The engine running voltage should not drop below 13 volts I don't care how much load it has on it!! .. Suspect defective alternator, buy the next one at NAPA.

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Popular Answer

What are the best Chevrolet repair shops?

RepairPal Certified shops can diagnose and repair your 2001 Chevrolet Blazer. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.

2001 Chevrolet Blazer auto repair 2001 Chevrolet Blazer estimates 2001 Chevrolet Blazer questions 2001 Chevrolet Blazer problems 2001 Chevrolet Blazer recalls

1 Reply

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pushrodon Apr 2, 2016

kpiloton Apr 2, 2016

I just replaced the alternator and it's not blowing fuses. Having this problem with a brand new alternator.....

pushrodon Apr 2, 2016

The engine running voltage should not drop below 13 volts I don't care how much load it has on it!! .. Suspect defective alternator, buy the next one at NAPA.

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Join the conversation!