Question about 2005 Mercury Sable

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My charging system light turns on but my battery n alternator are good. My battery gets weak but once I have it off for a couple of hours ile turn my car on again and my alternator will charge my battery again. this problem mainly accurs when the days are hot but when the days are cool my charging system light doesnt turn on as frequent. What can it be thats making my battery weak if my battery and alternator are good?

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  • Mercury Master
  • 1,949 Answers

Check for a alternotor fuse in box under hood and clean connections

Posted on Mar 27, 2011

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Truck starts with a boost but once cables are off battery indicator drops then truck shuts down unless engine is revved.


Check the alternator and the charging system. You may have a weak or failing alternator. If you have a voltmeter, get the battery reading with the engine off. A charged, good battery should show at least 12.6 volts. If you have to boost it, it must be low on charge. Recharge it or have it tested, a dead cell in the battery would not let it charge up.
Now take a reading on the battery with the engine idling, or idling as low as possible without dying. A good alternator and charging system will make the battery now read at least 13.5 volts. If your reading is lower than this, you probably have a weak alternator.

Mar 24, 2015 | 1994 Chevrolet Suburban

1 Answer

Battery goes dead while car is sitting


It wouldn't be the starter. It will not draw current when not engaged. Could be a light left on, a trunk light, glove box light, under hood light-an unintended drain, somewhere. Sometimes a penny or something gets stuck in cigar lighter and keeps that circuit on.
You should check if alternator is fully charging up the battery after it has run, and then turned off. But if you don't have a voltmeter handy, try this: When you shut if off to sit overnight, take the negative battery terminal off the battery. When you get ready to start it, hook up the battery and see if battery is no longer weak. If battery is now good, you do have an unintended drain. If battery is weak again, check charging system, battery cables and connections, alternator connections-a loose connection will prevent battery from charging.
If you have a drain, turn everything off and remove key. Pull the bulb out for the underhood light. Take negative off battery again, and hook up a testlight between the negative battery cable terminal and the negative battery post. If something is pulling current, the testlight should be bright. Now at fuse panel under dash, pull fuses one at a time and watch the testlight. If you pull a fuse and the testlight goes off, that circuit has the unintended drain. Check everything on that circuit.
Hope you find the problem. Good luck.

Dec 28, 2012 | Cars & Trucks

2 Answers

My brake lights will not turn on when I have the headlights on but it will turn on when the headlights are off. How do I fix this?


Your battery and/or your alternator is/are weak.
Proceed to Pep Boys/AutoZone/Advance Auto Parts, where they'll do a free "charging system test",
which will tell you which charging system component (battery or alternator) is weak.
If its the battery, they'll install your new battery for you free, as well.

Aug 17, 2011 | 1997 Nissan Sentra

2 Answers

I have a 97 escort, it has been sitting for a while so when i went to start it, no battery charge. Once i boosted it, it ran no problem, if you turn car off and try to start again, no charge. I left...


The first thing to do would be to put the battery on a slow or trickle charge for about 24 hours. It may be worn down enough from sitting that it needs to be revitalized. This should do it if the battery is still good. While it is charging, clean up all your cable ends and terminals to bare shiny metal. Do the battery, starter and alternator and the grounds in the engine compartment. Once the battery is charged up try it again. If the car will only start once or try to start once and need to be boosted, you will need a new battery. If it starts and runs repeatedly, then get the output checked on the alternator. A new one should charge at 14-14.5 volts but as long as it shows better than 12 volts it should be okay. Also when you are testing it, turn all your accesories on, radio, heater, A/C operate power accessories and watch to see how the alternator handles the load. The needle on your meter will bounce a little but should come back to where it was. If it doesn't then you will need to replace it as well. Hope this helps.

May 22, 2011 | 1997 Ford Escort

1 Answer

2001 Ford Windstar Battery light came on when driving by the time we got home all of the dash board lights were on. Turned engine off and it would not restart, sounded like dead battery when tried...


Hello and welcome to FixYa!


As a first course of action, I strongly suggest that you have the battery charged. It can be an indication of a weak battery or a faulty alternator. If the battery light still on after charging then the problem will surely be on the alternator itself. If that's the case the alternator should be replaced to resolve the problem.


You may try to reset it to by removing the positive battery connector, letting it sit for at least 5mins. then reconnect it again. This will reset the system and can get the battery light off.


Hope this helps and thank you for using FixYa! Have a good one!

May 12, 2011 | 2001 Ford Windstar

2 Answers

Car will not start without a boost. Once it does start, the engine putters and turns off after a couple of minutes. Once the car is off, when I attempt to turn on the flashers or power up the windows, I...


The flashing lights seem to be a common issue when the battery charge is low. From your description the battery may need to removed, charged, and tested possibly replaced. If it does require replacement you may want to have the starting /charging system checked. If there is an Autozone,Advanced Auto,or O'reilly's available in your area they will typically check this system out for you at no charge.

Jan 10, 2011 | Pontiac G6 Cars & Trucks

1 Answer

My battery light turned on. I checked the altenator. It was fine so I bought a brand new battery, but the light turned back on the next day? What else can be causing the battery light to turn on?


Hello and welcome to FixYa!


If the battery light is on, I strongly suggest that you have the battery charged. It can be an indication of a weak battery or a faulty alternator. If the battery light still on after charging then the problem will surely be on the alternator itself. If that's the case the alternator should be replaced to resolve the problem.


If the battery won't hold charge even on a new alternator then the problem will be on the battery itself. It surely is in the end of it's service life and replacement will be necessary.


You may try to reset it to by removing the positive battery connector, letting it sit for at least 5mins. then reconnect it again. This will reset the system and can get the battery light off.


Hope this helps and thank you for using FixYa! Have a good one!

Oct 23, 2010 | 1999 Ford Taurus

1 Answer

Starts with boost then car dies after 1 km and won't start


once the car is started it runs off the alternator .. so even if your battery is bad the alternator will still run the car .. so it looks lilke your alternator is bad .. when you jumped the car you charged the battery a little but not enough to keep it going since the alternator is not charging . if you hook up a charger overnight then you might be able to run it long enough to get somewhere (garage) .. try to drive when you dont need lights .. those will run down the battery in a short time .. if you have a volt meter then the battery should read about 13.8 to 14.2 volts when the alternator is working properly (car running) .. if it reads lower (like 12volts or less) then the alternator is not charging .. some auto parts stores will test your system free ..

Apr 05, 2009 | 1992 Volkswagen Passat

1 Answer

Draining juice out of battery like a open relay or something...


Try going to Autozone or local auto parts store they will check your charging system for free a good battery should not go dead just sitting there ,must be something draining it a light in the trunk or glove box or a radio that doesn't go off or a dome lamp

Mar 13, 2009 | 2005 Acura TL

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