Question about 2003 Ford Expedition

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Check Charging System/told not the alternator

I have a 2003 Ford Expedition...the battery light comes on and it says to check charging system. My gauge went all the way to L for my battery charge so I went and purchased a new battery because when they hooked it up to the machine it was only charged at 72%. It ran with no problem for 1 week. The auto zone guy even checked the alternator and he said it was nothing wrong. Then it started doing the same thing this past weekend. Took it back to auto zone and was told it was the alternator. Was on my way to my personal mechanic and the battery light went off, the check charging notification went off and the battery showed fully charged. My mechanic still put it on the machine but i was told since it showed no notification it showed nothing wrong. Last night I was headed to my moms and the gauge started going towards the L (low charge) again. I made it to my moms and turned my truck off, tried to start it again and it just clicked. Sat with my mom for 10min waiting on my fiance and when i went back out to try and start it, it started right back up and full charge. It cant be the alternator because it keeps starting back up with no need for a boost. Could it be the belt or is it something deeper...HELP!!!

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Check your battery connections - where the cables connect to the battery posts AND where the cables connect to the starter/main power feed and where the ground cable connects to the engine and/or frame. A poor or corroded connection can cause intermittent problems and poor charging performance.

Posted on Mar 03, 2017


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Posted on Jan 02, 2017

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SOURCE: Ford 2003 Expedition EB. Check Charging System

Its probably the alternator. It will need to be tested on the vehicle with the engine running and the light illuminated. Measure the battery voltage with the engine running. It should be at least 13.5 volts. If it is lower have the alternator tested at a shop with a charging system tester.

Posted on Feb 27, 2010

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2004 expedition want run on its own alternator is charging battery is good but all warning lights are on and dies when i take charge off

How did you test battery and charging system?
Your charging system is computer controlled. Check for applicable trouble codes. To check codes yourself, at the least you need an obd2 code reader that will check manufacturer specific codes as well as po codes.
Take wire connector loose from generator . The two wires on the left should show battery voltage, do they? What is the voltage spec? This is with key off and no charger hooked up.
The two wires on the right are to and from the computer, To check those, at least, you need a digital multimeter that has a duty cycle or frequency setting, with engine running, should activity on both wires. You have a battery temp sensor that could cause problems.


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press the helpful button, and check video link below
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Why does the Check charging system light keeps coming on and going off?

Check the battery cables. Have someone scan for trouble codes. If the light is coming on the computer is keeping those codes in memory.

Jun 24, 2014 | 2006 Ford Expedition

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Check Charging system light illuminates, all electrical shuts down and engine still runs on 2004 Ford Expedition 5.4l until battery dies. The opposite has also happened with the engine shutting down and...

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Check charging system and battery light flicker, as well as lights dim well driving

Sounds like your belt on your alternator may be slipping or you have a weak alternator. Could also possibly be a short.

Dec 07, 2010 | 2003 Ford Expedition

1 Answer

My check charging system and my lights is blinking off and on. I have replaced the battery and It's doing the same thing. Could It be another problem

I would have the alternator tested. Most local parts stores can test the charging system. I would also check the fuses.

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Today, my batter light came on, on my 2001 Ford Expedition truck. do you know what could have caused this problem? Alternator, maybe a new charging system...

The battery light means that the charging system is not working, and the most likely suspect is the alternator. Most auto parts stores will check your alternator for free, and let you know if it is bad or good.

Mar 18, 2010 | 2001 Ford Expedition

1 Answer

Ford 2003 Expedition EB. Check Charging System

Its probably the alternator. It will need to be tested on the vehicle with the engine running and the light illuminated. Measure the battery voltage with the engine running. It should be at least 13.5 volts. If it is lower have the alternator tested at a shop with a charging system tester.

Feb 27, 2010 | 2003 Ford Expedition

1 Answer

I have a 2000 Ford Expedition. The battery was

The battery light is telling you that you are running off the battery,and you have a problem with your charging system. An easy way to check your alternator is to get a volt meter, and measure the voltage of your fully charged battery. with your expedition not running, it should read about 12.6 volts. When you start your expedition, it should read approx 14 volts if your alternator is working properly.
Of course, check all of your connections first, and most auto parts stores will check your alternator out for free, so they might have a chance to sell you one!

Nov 20, 2009 | 2000 Ford Expedition

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Why does the battery light keep coming on after

The battery light indicates insufficient voltage. I would recheck all the battery connections to be sure they are clean and tight. I would also have the alternator output tested, since the light will come on if the alternator is not providing sufficient voltage to keep the battery charged. Take the vehicle to an autoparts store and they will test the battery condition and alternator output for free. Sorry for your trouble and I hope this helped, Best wishes.

Sep 26, 2009 | 2003 Ford Escape

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