Question about 2007 Mercury Mariner Premier 4WD

1 Answer

Battery keeps going dead

Replaced the battery. Dealership checked electrical system to make sure it was charging the battery. It passed. Then they did a load test to see if something was pulling a low charge when engine was off. That was negative. Then they said they tested each circuit in the fuse panel and found nothing. Does anyone have suggestions or experience with this?

Posted by on

  • kwatt Feb 05, 2009

    MrScary...Thanks for the solution. I just checked the tension on the belt and it is very tight. Do you have any other ideas on this extremely frustrating problem?



1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert whose answer got voted for 500 times.

  • Master
  • 1,990 Answers

Check the Tension on the Belt. If the Belt Tensioner is not Holding the Belt Tight Enough it will not allow the Alternator to Charge the Battery and will cause the Problem Listed Above. Please Rate My Response! Thanks!

Posted on Feb 05, 2009

  • Travis Humphries
    Travis Humphries Feb 05, 2009

    Not Really since they have Checked Everything else. This may just be a Problem that the Dealership needs to Address with there Diagnostic Equipment since it is Model Specific. I wish that there was an Easier Diagnosis for this Prob.



1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

What can cause my battery to not stay charged

You need an auto electrician to check out your vehicle's electrics.

Apr 11, 2013 | 1994 Buick Century

1 Answer

Battery going dead. shows check engine light

If you battery is going dead and the check engine light is on then you alternator is going out. Heres what to do, replace the battery and have the charging system check by a local repair shop. If you alternator is bad it will cause the battery to go bad as well, so testing the vehicle with a dead battery will not bring back any accurate results. An altornator is in charge of keeping you'r battery charged to sustain enough power for you vehicle. If you replace the battery and the problem persist, then you have a short or current draw in the system causing the battery to drain. If thats the case go and see a specialist and have them do an electrical diagnosis.

Hope this Helps!

Jun 01, 2011 | 1995 Jeep Grand Cherokee

3 Answers

Battery died,replaced,anything I should do.

Check the charging system, clean the terminals.

Feb 08, 2011 | 2000 Buick LeSabre

2 Answers

Went to start my car - dead - the lights inside work - this happened once before checked the battery it is good and cleaned the battery post and cables and it worked fine- could it be the altinator?

How do you know the battery is good? If you are sure the battery is good (not sure how you determined this), then you should check the charging system. You can do this by checking battery voltage with engine off, then again with engine running. Voltage should be 1 - 2 volts higher with engine running if charging system is working. This is just a quick check, but will definitely identify a charging system that is not working at all.

Aug 21, 2010 | 2002 Ford Explorer Sport Trac

2 Answers

Car stalls then battery goes dead


May 19, 2010 | 2000 Nissan Maxima

2 Answers

Battery keeps going dead in 2004 H2

because you are going back to a dealer
take it to an accredited auto electrician and have the electric system checked properly instead of guessing the fault

Jun 20, 2017 | 2004 Hummer H2

1 Answer

Battery keep going dead, has new battery

Have you checked to see if the alternator is charging ? Run a volt meter on the battery with the engine running, have to have more than 14 volts. If 13 or less, then replace the alt.

Jan 18, 2010 | 2003 Chevrolet Venture Passanger

1 Answer

2009 srx will not power in vehicle.key will not come out of ignition.

It sounds like the battery is dead and needs to be charged or replaced, Once the battery has a charge from a battery charger or by having the car boosted with another car to start it, the ignition key's should come out of the ignition. You need power to the electrical system for the ignition to have the keys come out, Note do not force the keys out. Forcing the keys out can and will damage the Pass-lock system to the ignition. Good luck and keep me posted. be glad to know you got your car running again.

Oct 27, 2009 | 2009 Cadillac SRX

1 Answer

Radio equlizer lites flash all of the time.

Seems like you've got it under control

Aug 13, 2009 | 2001 Dodge Intrepid

1 Answer

My baterry keeps on going dead and i had the altenator checked and it passed

Here's the key parts of the electrical system.
Battery: the source of your electrical energy
Alternator: The charging source for the battery. Driven by the engines rotation via a fan belt
Regulator: tells the alternator when your battery needs to be charged and how much.
The Load: all of the devices that use the batteries energy

If you have replaced the battery 3 times we can rule out the battery as the problem
You had the alternator check and it passed. We can rule out the alternator
The load: It's fixed and for the most part you can control most of this with knobs on the dash
That leaves only the regulator. If the regulator is giving bad info to the alternator that could account for the problem.

Try this ( if you don't have a voltmeter, places like AutoZone can make these measurements)
Start the engine and measure the voltage at the output of the alternator. It should be about 13.5 to 14.0 volts. Then measure the voltage at the battery terminals. It should read the same as what you got at the alternator. If it's not,check the battery cables for clean bright connectors. Use a battery terminal brush to clean the. If this still doesn't help check the regulator.

Hope this helps

Good luck Loringh

Oct 22, 2008 | 2001 Mitsubishi Montero

Not finding what you are looking for?
2007 Mercury Mariner Premier 4WD Logo

205 people viewed this question

Ask a Question

Usually answered in minutes!

Top Mercury Experts


Level 3 Expert

77186 Answers


Level 3 Expert

5575 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22265 Answers

Are you a Mercury Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides