battery not starting again after letting it run for 40 minutes

Katrina Raven

Asked by Apr 01, 2016 at 01:53 AM about the 2002 Chevrolet TrailBlazer LT 4WD

Question type: Maintenance & Repair

Car ran fine all day. I left an inside light on but not sure for how long. When I
returned to my car it was dead. I heard  a whishing sound. Roadside assistant
came out and checked battery said it was fine. Told me to let it run for 30-40
minutes so the alternator could recharge the battery. I did as told but after 45
minutes of letting it run and turning it off. Dead.

4 Answers


Do you have a Battery charger? Or a Jumper box? If u do charge your battery up it should be ok. Good luck!

1 out of 1 people think this is helpful.
Tom Demyan

How old is the battery? You can remove it and have your local auto parts store test it by putting a load on it.

1 out of 1 people think this is helpful.

Hate to say this but you were given some bad information there. Alternators are not designed to recharge a dead battery, doing so greatly shortens the life of the alternator, more than a couple of times I have seen someone do this and burn out the alternator in under 10 minutes. So have the battery load tested if it fails replace it then have the charging system checked just to make sure it didn't damage the alternator. HTH

1 out of 1 people think this is helpful.
Katrina Raven

Thanks for your answers! The battery is not old and the guy checked it said no cracks or leaks. I will take it to auto zone where I bought it and get it tested and see what happens. I was wondering though if the alternator perhaps was causing this? Not sure what that whishing sound is when I turn the ignition off...even though the car doesn't start. Thanks

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