1990 Mercury Grand Marquis Logo
Posted on Jun 10, 2009
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Dead Battery Possible alternator problem

I found my car battery completely dead. So I charged it and started the car and drove it only two miles when turning a corner, the car stalled and had absolutely no power to start the car. After I got it jumped and got home, I checked the specific gravity of the cells to find that they all were below 1000. You can't read below 1000 anyway. The battery is only 6 months old. It's an 84 month battery. Could it be the alternator and how do I know for sure? Can I get a repair kit for a 1990 Grand Marquis?

1 Answer

Marvin

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  • Mercury Master 85,242 Answers
  • Posted on Jun 10, 2009
Marvin
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Joined: Jun 20, 2008
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Do u have a battery light on? if not most likely the battery is no good, if this is not a Motorcraft battery be suspect of it, have Autozone test it and the charging system, it is free.

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2007 rav 4.Battery light came on, drove 20 miles on hwy. stopped, shut car off.started car with a very slow crank. Power steering was gone, all warning lights came on barely made it home. now dead.

Used your battery up just getting home. Now recharge the battery, and test the charging system- could be a bad alternator not charging the battery.

Normally, the alternator powers all the car's electrical needs when the engine is running. If the alternator fails, the battery will then be used to run the electrical needs until the battery is depleted, then the car will shut down. Dead, just like yours. No big deal, just find out why the charging system stopped.
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Battery dead. recharged, car started. drove 20 miles. parked 8 hrs. drove back home. after parking 15 minutes car wont start. Which is problem, alternator or battery?

Don't know.
You would need to have both components tested. It could be a dead cell in the battery. Or a bad connection. If the alternator were at fault it should discharge when the engine is running and slowly go dead.
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Running fine, all of a sudden car is completely dead

sounds like short somewhere draining battery. Might be alternator causing this also. can have it checked at autozone at no cost....good luck and hope this info helps....Please rate this post.
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I am trying to do this from home have no testing equipment and do not know what iI need to test. I drove the car on Sautrday had not one problem. Tried to start the car on Sunday and I had absolutely no...

Hello,

Based on your problem, that I read fully twice, based on ALL THE things that are dead, this is positively a battery charging system problem.

Meaning this, Sense nothing works including head lights, which would work most likely, and they don't you are going to find this problem in a couple possible places. It appears your battery is dead. Now, listen if your battery is not dead or is good, the cables (positive or negative could be loose, or bad connection. What could also of happened, to cause this is a couple of things. If you have a bad alternator as you were driving it, it would not be charging your battery and actually draining it, with all your electronics on while driving. So, when you parked it, that battery most likely is completely dead or a positive of ground from that battery if loose or poor connection, allow the alternator not to charge battery while driving.

In conclution. Check good the battery, and connections and then the alternator. Now, sense you have no testing equipment as you stated, hard to test the alternator, all you can do, is somehow charge your battery and get car going and try and drive to closest battery place, even auto zone can check your battery cells and your alternator. I hope this helps. Mike
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The 12 volt battery(LUCAS 065/3) on my FORD FIESTA 1100cc is 4 years old, in that time i have only driven 1,600 miles as my journeys are usually very local. I make sure i use the car twice a week to keep...

Running so few miles has accelerated the aging of the battery - the battery never had a chance to fully recharge in such small trips -  so now you have to replace it a year sooner than usual.
Just replace it.
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Just drove my car 50 miles, shut it off and now won't start. Appears the battery is dead. Jumped it, drove it, turned it off and tried to restart. . .DEAD! Also, as i was driving my check engine light...

check ur alternator one way to checkthis is turn on car and remove positive cable wire on car while on if it turns off its ur alternator its what keeps ur battery charged
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