Question about Mercury Cougar

1 Answer

My battery keeps being drained and i just bought a new battery and alternator and the battery still continues to be drained.

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Mercury Master
  • 5,687 Answers

This is going to take time for you or whomever works on the car to find the problem. There are several methods to use, but the good news is that a simple Ohmmeter, Voltmeter, or testlight is all you need.

First, I suggest taking the vehicle to Autozone or Oreillys and have it scanned for free. Also ask if they would do a Starter Draw test for you. You did not include what model Mercury you have, there were recalls on the Cruise Control module which would never shut off and always drew power.

When you connect the main NEG cable to the Battery. there should not be much of a spark. The onboard computer, clock, and Antitheft will always draw some power. When you have the radio, A/C, and every switch turned off, the balance of the car should be dead.

You have a choice on what you want to do first. In any case you may have to reset the Inertia Switch for the fuel pump by pushing a button on it if the car does not start after you are done.
1. With the NEG cable disconnected, you can open the Black Power boxes under the hood and pull and replace the Relays. Look for green corrosion and fix or clean those Terminals.
2. You can hook up a Voltmeter between the loose NEG cable and the Battery post.
3. After attaching the Voltmeter, with everything off in the car, pull and replace the fuses in the fusebox under the dash until you make the Voltmeter drop.
4. The circuit you kill should have a shorted out part on it. You will either need an Owners manual or leave the fuse out and see what does not work when you reconnect the battery and start the car.

Some items that have caused this problem in Mercury products are Cruise controls, Ignition switches, power seat buttons, window motors, Rear defrosters, and Doorjam switches. If you have Air suspension and an air leak, the suspension will try to pump up the car whether you are in it or not.

I hope the trip to Autozone or Oreillys will save you some of the discomfort on locating your problem.
I hope you feel I have been helpful and Thanks for using Fixya.

Posted on Nov 05, 2010


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

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this 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 repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


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



Related Questions:

1 Answer

I have a 2000 Chrysler Concorde, and the battery light keeps going off an on. I've already bought a new battery and Crankshaft Position Sensor. It's been starting hard and the battery just died in it.

Did you have the alternator checked? When the battery light comes on, it indicates either the battery is very bad and is draining power from the system, or the alternator is not providing enough voltage to keep the battery charged.
Once you have the electrical problem taken care of, and the system is getting proper voltage, you can see if you continue to have problems with the engine performance. (The crankshaft position sensor has nothing to do with battery charging)

Sep 08, 2016 | 2000 Chrysler Concorde

1 Answer

Battery keeps draining already put in a brand new alletantor and brattery still draining and battery lights comes on and truck won't start

You would have checked the charging system before replacing the alternator, so I will assume the charging system is good.
If the battery is being discharged overnight or over a few days, you would need to disconnect it and check every circuit on the truck to find the drain.

Oct 10, 2012 | 1990 Ford F150

2 Answers

Am having grand cherokee limited edition 2003, 4.0 the problem is the batery keeps draining. I bought new batery but still drains.Always meet the batery dead.Please, help

If you have a loose fan/drive belt. That would cause the problem. Just tighten it up. Corroded conctions at the battery but you should have cleaned those when you bought the new battery. Have you had the Alternator checked? Perhaps loose or corroded connections at the alternator or a bad alternator. You can remove it and bring it in to a parts store. Many of them will run a check on your old one before selling you a new one. You could have left something on that drains the battery. A light somewhere or even a short causing a power drain.

Jun 08, 2011 | Jeep Grand Cherokee Cars & Trucks

1 Answer

Hello, I have a 1986 Jeep Comanche, 4 cylinder 4x4 5 speed that i just bought used. The battery is brand new, same with cap rotor wires and the alternator i just bought. the jeep kept draining the battery...

If you mean it is going dead while sitting you might have a short or another issue drawing power from the battery. take your truck to your local battery warehouse/store the should have a meter thet will tell you if something is drawing on your system. It could be something simple, like maybe the mercury switch on your under hood light is bad and the light is not turning off thus running your battery dead over night.

Mar 12, 2011 | 1987 Jeep Comanche

1 Answer

My battery keeps draining, i bought a new battery and alternator but still it keep draining.

Please see my tip at . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.

Oct 22, 2010 | 1994 Isuzu Rodeo

2 Answers

Battery keeps going down on 1994 LS400. new battery bought in Oct. Could it be the starter?

More likely, the alternator is not putting sufficient charge back into the battery as it runs. Take the car to Autozone or similar business that gives free checks of the alternator operation. If it checks ok, then you likely have a constant load on the battery that takes charge away all the time--a light in a hidden place that is not being switched off like a trunk, glove box, or under-hood light. Remove the negative battery cable, and insert a test light between the cable and negative battery post. If there is some circuit drawing current, the lamp will light. Try removing the fuses one at a time to see if something continues to run there (the car must be off and all openings closed or it's light disabled). Hope this helps!

Aug 16, 2010 | 1994 Lexus LS 400

2 Answers

Battery keeps draining

if your battery died while driving and the car cut off while your driving,, your problem is from your alternator!!!,, on a normal working car, you can start, remove ther battery terminals and the car would still run cause the alternator will be powering the car. In your case the alternator isnt working and the car was working on battery power therefore when the battery went dead the car cut off.. Your alternator need \s to be charging between 13.5 and 14.2 volts.. as little as 10 volts will keep the vehicle running.. I'd suggest you have the alternator replaced.

May 06, 2010 | 2003 Chevrolet Impala

2 Answers

Battery keeps draining new battery and alternaltor

Sounds like an alternator. When it goes bad, your car is forced to run off of the battery , which wont last long depending on what all you have running .
The alternator keeps your battery charged after your car starts.
Try replacing the alternator and let me know if you have any more problems.

Mar 12, 2009 | 1998 Ford Windstar

1 Answer

Battery keeps draining

Try going up to the auto parts store and getting your alternator checked.

Nov 25, 2008 | 1996 Jeep Cherokee Country

2 Answers

Draining battery

i think the problem is not with the battery,you better send your car to the workshop to fix it...i think the problem is on the wiring..

Nov 10, 2008 | 1997 Isuzu Rodeo

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

189 people viewed this question

Ask a Question

Usually answered in minutes!

Top Mercury Experts


Level 3 Expert

79851 Answers


Level 3 Expert

5687 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

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

Answer questions

Manuals & User Guides