Battery Light On...Fluke?

adv5500 · Jun 28, 2009

My battery light came on today. I opened the hood and disconnected a battery terminal and the car stayed running, so the alternator is good (it's also only a month old). I checked the battery with a tester and it said it was good and taking a charge. What's going on? Why does the light stay on?

flyingbrick · Jun 29, 2009

Looking at your alt from the passenger side, at the back you'll see 2 electrical connectors, get a small flat head screwdriver, and a pick, you want to remove the small connector with only one wire going to it, clean the inside of the connector, and the alt side terminal. then lay some grease on said terminal, and your light should go off.

I know this cause i had to do this on Sunday my self.

AllanD · Jun 29, 2009

Disconnecting the battery or the alternator with the engine running is an excellent way.... to blow up the diodes or the voltage regulator.

What you did is no better a diagnostic method than having your grandmother give it a good wack with her cane.

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mrcarcrazy · Jun 29, 2009

have the alternator and battery tested.

Check your grounds.

Bob Ayers · Jun 29, 2009

AllanD said:
Disconnecting the battery or the alternator with the engine running is an excellent way.... to blow up the diodes or the voltage regulator.

What you did is no better a diagnostic method than having your grandmother give it a good wack with her cane.

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Worse than that, the voltage spike from the di/dt can blow the PCM, GEM, all sorts of expensive electronic equipment!

Don't ever remove a battery terminal with the engine running!

locovaca · Jun 29, 2009

Bob Ayers said:
Worse than that, the voltage spike from the di/dt can blow the PCM, GEM, all sorts of expensive electronic equipment!

Don't ever remove a battery terminal with the engine running!

I can vouch for it blowing a radio in a Sentra I was fixing up and it had a bad connector... came off going over a bump, radio out of commission.

Battery Light On...Fluke?

adv5500

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flyingbrick

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AllanD

TRS Technical Staff

mrcarcrazy

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Bob Ayers

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locovaca

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