Battery Light on when cold after warming up (20min) goes off? | Ford Explorer Forums

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Battery Light on when cold after warming up (20min) goes off?

  • Thread starter Thread starter Yukonvic
  • Start date Start date
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Yukonvic

I would like to know what is happening with my charging system? What is the best way to
check this out? When I start the truck the battery light is lit and the Voltmeter is at about 8-9volts and after about 20 min. of warming up the truck it jumps back to 12volts and is fine?? Any ideas? I just installed a new battery so I know it isn't that?

How can I test the alternator?
All comments are appreciated.....! Thanks
 






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