Question about 2001 Ford F150 Styleside SuperCrew

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Battery light comes on then blink then goes away town car 1999

When I start the car the battery light comes on, then while I am driving it starts blinking and then goes away, it does not staul and my AC is on and radio on. what could be the problem?

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Hi Uncle_Henry,

It sounds like an intermittent alternator problem.
You said 'while you are driving, it blinks and goes away'.

Does it do this if it's just idling? Or only at higher revs?

First check that the belts are tight.

If you have a voltmeter, you can run the next test. If not, many auto parts stores will perform battery and alternator testing at no cost.


Test the voltage at the battery terminals with the engine off. It should be 12-12.5VDC.

Then start it up. Test again while the battery light is on.
Normally the charging voltage will be +13.5VDC.

Drive it until the light goes out, Test again. If there is a significant difference, the alternator is developing a problem and will soon need replacement. At least it gave you a warning and didn't leave you stranded.

If there is no difference and the voltage is above 13.5 while running, the charging system is OK.

Hope this helps.

Happy New Year Uncle Henry
Mike

Posted on Jan 03, 2009

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Hi ...... Have a look at the belt, sounds like it's slipping and needs adjusting or fluid is leaking onto it.

Posted on Jan 03, 2009

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