Best Answer

Either the battery is very weak or the alternator has bad diodes .

User Avatar

Wiki User

โˆ™ 2006-03-25 15:03:32
This answer is:
User Avatar

Add your answer:

Earn +20 pts
Q: Why does the battery in 1999 Mercury Grand Marquis go dead in a few hours after turning off motor and headlights?
Write your answer...
Related questions

Does turning on your headlights after jump starting a car help charge the battery?


What causes the dashboard light to dim after turning on the headlights?

Because the power for your headlights is pulled from your battery. When the dashboard lights dim after turning on the headlights the dashboard lights aren't getting as much power as they were with the headlights off. With the motor running or off? The headlights draw a lot of current, but should not visibly affect other systems. There could be a problem with a worn out battery, an alternator that isn't charging correctly, or you have a bad earth between the battery and the chassis. Check the large cable connection between the battery (usually negative these days) and the bodywork, or between the engine block and the bodywork.

How do you unlock the steering wheel for a 1988 mercury grand marquis?

Try "rocking" back and forth while turning ignition key

Why Squeaking Sound while turning the steering in Mercury Grand Marquis?

Its the bushings on your suspension, It will cost $200 dollars to replace at a shop.

How do you change plug in 2001 Mercury Grand Marquis?

Remove the spark plug wire from your 2001 Mercury Grand Marquis. Remove the spark plug with a 5/8 deep well socket, white turning it to the left. Reverse the process to put in the new spark plug.

What could cause a 97 Hyundai Elantra to die after turning the headlights on and it not being the alternator?

Bad/shorted battery? (doesn't not hold a charge)

Why is the interior dome light on my 2000 Mercury Marquis turning on and off after the car has been shut off?

Could be one of the door sensors causing this.

When her car would not start Joan began to solve the problem by turning on the headlights to see whether the battery was dead Her approach is an example of?

Process of elimination.

How do you replace 2002 Mercury Grand Marquis 4.6l spark plugs?

Remove the spark plug wires from your 2002 Mercury Grand Marquis spark plugs. Remove the spark plugs by turning them to the left with a deep well 5/8 socket. Reverse the process to install the new spark plugs.

How do you reset the computer on a 1995 Windstar?

Remove negative battery cable. Turn on headlights. Wait 15 minutes. Turn off headlights. Replace negative battery cable. Better, go to Autozone, ask them to plug in their OBDII analyzer and hit "Clear". that way you do not clear the corrections the computer has added to the system and will have to relearn if you remove the battery cable. just remove the negative battery cable,wait 5 min,and put it back on,, computer will reprogram all by itself. Pre 1995 vehicles disconnect battery for 10 Minutes minimum Whats with turning on headlights with the battery cable removed? They will not work anyway

Why do your headlights pop up when turning on your parking lights?

They don't

Why does a 1990 Volvo 240dl died after hearing noise thru radio and turning on headlights on?

Sounds like the charging system failed and the car ran until battery power was deleted.

What is grinding crunchin sound when turning my mercury marquis in either direction?

If you vehicle is front-wheel drive, more than likely, that grinding crunching sound when you turn is coming from the CV joints.

Will 22inch rims fit on a 2005 mercury grand marquis without a lift kit?

yes, but you will lose turning radius, rubbing and bottoming out. strongly recomend 2 or 3 inch lift

What would make a 97 Ford Taurus die when turning on the headlights?

The alternator may not be charging. There may be a bad connection from the battery positive or negative to the vehicle circuits. The headlights large current draw is causing the voltage to drop below what the computer needs to operate properly

How do you adjust headlights on 96 silverado?

The headlights on a 96 Chevy Silverado are adjusted by turning the screws on the top and side of the headlights. It allows the lights to be adjusted for optimal night vision.

How do you unfreeze a Pantech matrix?

try turning it off then removing the battery then putting the battery back in the turning it on. it worked on mine

How do you adjust the headlightS on a VAUXHALL tigra?

The range of the headlights on a Vauxhall Tigra may be adjusted by turning the adjuster wheel. It is located on the dashboard of the vehicle.

What cant cause a misfire on a dodge magnum?

Turning on the headlights with the engine turned of.

Why is the iPad not turning on?

It may be out of battery.

What is the turning radius of a Mercury Villager?

The turning radius of a Mercury Villager may depend on the year in which it was made. The turning radius is 38.7 feet for vehicles made during the 1993-1998 period.

You turn on car dash lights up but it does not start?

If it isn't turning over then it may be a problem with your starter motor. If it is turning over but not starting then it could be a range of things. Fuel pump would be one thing to check. If you turn on headlights and they are very dim then it could be that your battery is very flat (but enough charge to still run the dash lights as they are a much lower power rating then headlights etc)

How do you turn the headlights on on a hyndai getz not the full beam?

There are three headlight settings on your headlight switch. You can turn the low beam headlights on by turning the headlight switch.

Why would your engine stutter when turning on the headlights?

Weak alternator. Have the charging system checked. I had a 95 Toyota tercel that totally shut down when the headlights turned on and the cause was for the most part dirty battery connections, when the electrical load was raised the alternator could not immediately keep up and required a moment to adjust, but with a bad battery connection (probably the Positive in my case) it couldn't temporarily draw enough power from the battery to still fire the spark plugs hence the immediate stall.

Why is engine not turning over?

Ck battery