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Idles really high and drops down then the battery light flashes

Tiny
MELVIC
  • MEMBER
  • 2004 FORD EXPEDITION
Press the gas the battery light goes off but the truck runs rough as if it is out of gas. Turn off truck and turn back on again idles really high then drops. No engine light on just battery light when it I press on gas light turns off.

When I start my truck in the morning after it has been sitting for 7-9 hours it idles really high and drops down then the battery light flashes.
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Friday, June 8th, 2012 AT 10:54 PM

13 Replies

Tiny
SATURNTECH9
  • MECHANIC
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We need to start by doing a voltage test do you have a multimeter to do some testing?Sounds like you could just have a bad alternator.
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Friday, June 8th, 2012 AT 11:05 PM
Tiny
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Already had the test. Battery alt and starter passed
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Friday, June 8th, 2012 AT 11:07 PM
Tiny
SATURNTECH9
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The battery light is on when at idle and its running bad two things that point to a bad alternator. If it was just the battery light on I would say may just a fault in the battery light circuit. But with the other symptoms I really want to know at idle what the voltage reads at the battery when the battery light is on.
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Friday, June 8th, 2012 AT 11:16 PM
Tiny
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When started it idles between the 1 and 0. And battery light on. If I give it gas light turns off. If I don't give gas truck dies
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Friday, June 8th, 2012 AT 11:27 PM
Tiny
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I tool it to autozone for testing and he said the alternator passed
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Friday, June 8th, 2012 AT 11:29 PM
Tiny
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Also he said he could be a vacuum leak. Does that sound familiar. I just had to replace that last summer. Kind of getting the same symptoms but last summer the battery light didn't come on
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Friday, June 8th, 2012 AT 11:32 PM
Tiny
SATURNTECH9
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I dont see how a vacuum would cause the battery light to come on?The first thing I would do is what I told you to do with the voltage reading. That is what I need you to do and give me the results?I have been working on cars for a long time now so when I ask you do something I need you do it. Because I cant do it for you so please let me help you and make it easy as possible.
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Friday, June 8th, 2012 AT 11:41 PM
Tiny
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Ok no problem. I appreciate Your help. I am single mom so I have to do it myself. I am not understanding what you mean by what the voltage reads. Do I need to look at the battery when I start the truck
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Friday, June 8th, 2012 AT 11:47 PM
Tiny
SATURNTECH9
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To read the voltage you will need a multimeter/volt meter to read the voltage. You dont know anyone that knows how to use a volt meter?
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Friday, June 8th, 2012 AT 11:59 PM
Tiny
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Yes I will ask. It may be an hour or so beforei can give you a answer
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Saturday, June 9th, 2012 AT 12:10 AM
Tiny
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You will be testing more voltages after that.
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Saturday, June 9th, 2012 AT 12:13 AM
Tiny
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Ok
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Saturday, June 9th, 2012 AT 12:35 AM
Tiny
SATURNTECH9
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Also raise the rpms up so the battery light goes out and read the voltage and write it down.
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Saturday, June 9th, 2012 AT 2:33 AM

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