Question about Ford Expedition

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My 98 expedition battery keeps dying and we have replaced altenator and voltage regulator. Battery has test good. What else could it be?

The battery will die if it sits 12 hrs or overnight without being started

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  • 435 Answers

It could be many things, like a faulty ignition switch, a burned circuit on your dash panel board, any kind of a slow drain (poor ground) in the wiring, but I'd go with the ignition switch if it was me.

Posted on Mar 30, 2014

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Posted on Jan 02, 2017

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fixincars
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SOURCE: Car dies and battery light comes on.

Will it crank over when it won't start? When It dies check for spark at the sparkplugs if none change the ignition module.
http://www.aceautomotive1.com FaQ and BLOG

Posted on Aug 01, 2008

  • 50 Answers

SOURCE: 99 discovery/ dies while driving

sounds like the belt is loose. if it has a tensioner check and or replace it, if not tighten the belt. or the alternator tests ok but is actually not working at low rpm. or the battery is shorted. electricity is tricky

Posted on Dec 07, 2008

frcs68
  • 1605 Answers

SOURCE: 85 Honda Prelude Battery keeps dying

check for electric short.
if you have factory or after market alarm, that may be the cause.

Posted on Jan 09, 2009

  • 416 Answers

SOURCE: needs jump

Check the battery for charge and alternator for power (free at Autozone) It might be deposited/rusted contacts on alternator and battery to reduce the electric current to battery from altrnator so battery just draining out. Also if it is very cold overnight (less than 0 F) battery lost the cranking power.
Please kindly let me know if the information provided was usefull for you or you need more info
Good Luck

Posted on Feb 05, 2009

  • 1 Answer

SOURCE: I own a 89 toyota toyopet truck. The EFI fuse

I had the same problem with my 1990 P/u. It turned out to be the O2 sensor touching the underside of my box shorting and blowing the EFI Fuse

Posted on Oct 26, 2009

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Left lights on my jeep cherokee have recharged battery but it goes flat with in minutes and engine dies


Run this by me one more time your Post doesn't make sence. Is Battery light on? Is alternator working properly 13 to 14 Volts You Must have a fully charged Battery to test. Get tested at your Local Auto Parts Store after charging

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Battery keeps dying


well if the battery is good when you leave it it must have a voltage draw you have to take off one of the leads off the battery and put a inline amp meter to see how much draw..then you use an amp meter a light or buzzer and you pull fuses till the amps go down the light goes out or the buzzer stops depending on what you used.. then you go from there ..your going to need a schematic of the electrical system to see exactly what is off that fuse...or leave it out if you can live without it..interior lights ect

Mar 30, 2014 | Ford Expedition Cars & Trucks

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I am having problems with my battery charging in my 1990 cadillac brougham. It has a new altenator when tested in car it says bad voltage regulator but when bench tested it says good. I have replaced the...


this would be the voltage regulator, keeps the voltage at the correct level if this unit is faulty if will think it is fully charged at 13.8 volts where it turns off the charge when it may be thinking at 6 volts it is full

Nov 25, 2013 | Cars & Trucks

1 Answer

Car starts most of the time but sometimes you have to wait 10 minutes before you try again, gauges always going crazy, car died going 50 mph, battery always tests at 12-13 amps alternator testing always...


your altenator has a built in voltage regulator in the back of it. suggest you replace the altenator to make the problem go away.the car will do all kinds of crazy stuff if it's not getting 12volts all the time, it won;;t get 12volts all the time because the regulator isn't operarating properly.you're running off the charge in battery most of the time because the regulators kicking in @ out after it heats up. hope this helps!!

Oct 03, 2010 | 1991 Chevrolet Cavalier

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My battery keep dying and won't hold a charge.


I have the same exact problem. First thing I did was replace the battery. Still having problem. Alternator charges then, an hour later the battery is dead. I was at a stoplight and suddenly the air amd radio quit for a couple of seconds, the volt meter hit bottom, then kicked back in and everything worked again. Turned the car off, started it back up. Parked, went inside, came back out, battery dead. New battrery, Good alternator, could it be the regulator shorting out? do they have regulators anymore?  

Jun 26, 2010 | 2000 Ford Expedition

2 Answers

Why my battery keep dieing


Take the battery in at any auto parts store and have it load tested. They will tell you if its a good battery or not. If not get a new one and then test the altenator with a volt meter. If no access to a volt meter take the altenator in and have that tested. If you do have one start the engine and run the probes from the volt meter this way. The positive probe to the negative terminal of the battery and the negative probe to the positive side of the battery. If a reading of voltage shows the diode inside the altenator is at fault. If the reading displays the OL feature on the display the diode is good. Now switch the probes to red on red and black on black and see if it shows 13.5 volts. If it is less than that voltage the altenator is not producing a good charge to the battery so it will need to be replaced too

Apr 04, 2010 | 1997 Buick Skylark

2 Answers

Why do my headlights and interior lights dim and then battery light comes on


Because your battery is low and your there is a problem in your charging system. Loosen the nut on the negative battery terminal, start the vehicle and then remove the NEGATIVE terminal cable. If you have cables that mount to the front of the battery then start the vehicle and remove the negative cable. If the vehicle dies your alternator or voltage regulator are bad. Most likely the alternator. remove and replace. If the vehicle continues to run turn the lights on and see if it continues. If that is good, drive to Auto Zone, and ask them to come out and help you test the battery. They have a portable machine that will test it for you or have you bring the battery inside and test it for you, they will even help you install the replacement battery if needed.

Mar 10, 2010 | 1999 Buick Century

2 Answers

98 expedition battery light comes on with increase of rpm


There may be no loss of voltage, but is there a surge of voltage?

As for the battery itself when tested, it should read 12-12.5Volts across the
leads when the car is off. When the car is running, the battery should be reading 13-14Volts across the leads, anything lower means the alternator is not charging your battery, anything higher means the alternator is over charging and damaging your battery.

Another cause for the battery light could be your ECU has detected an error

Aug 20, 2009 | 1998 Ford Expedition

1 Answer

Voltage regulator


Voltage regulator is built-in to the alternator assembly.

Have you tried replacing the battery?
A battery with a shorted cell will not charge properly and may even damage an alternator or regulator.

Note1: use a digital voltmeter (about $25 at Lowe's or Radio Shack) and check voltage across batt terminals while engine running. If more than 12.6 Volts DC and more typically about 13 Volts, then the alternator is working.

Note2: from Jan 98 to May 98 shows a different part # alternator than June - Dec 98
check the manufacture date on your driver door edge.

Oct 25, 2008 | 1998 Mazda Protege

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