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Battery light on 2005 Toyota Corolla

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Tried to start my car and it wouldn't start tried it again and the car started with no problem. While driving the radio went out for a second came back on and then the battery light came on for about 2 seconds and disappeared. The lights didn't dim and the battery light never came back on. Any ideas what the problem could be?
(1) Answer
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The plunger and contacts in the starter fail and can initially be intermittent they are replaceable at a fraction of the cost of a starter but most people change the starter. First check that your battery connection are clean tight and secure.
It could be a bad or unsecured battery ground cable between the battery and chassis or chassis and engine. Put a volt meter across the battery terminals with the engine off, at rest the battery voltage should be 12.6 volts if the battery is fully charged. Now get a friend to start the car while you watch the voltmeter, the voltage reading across the battery should read approximately 14.6 volts if the alternator is charging correctly.