Question about Mercury Mountaineer

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2002 mercury mountaineer electrical problems

Brand new battery and alternator. lights nincluding interior acts weird. battery will hold a charge long enough to get alt back to amps. truck will run but once cut-off, seems to almost immediately lose charge. int lights will turn on/off along with dash panel at what seem to be random moments! any thoughts? tranny was just replaced/rebuit. can't make time to jump every time. Could it be a relay or short ground?

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  • 2,871 Answers

Do a parasitic battery drain test to find what's draining the battery

Posted on Jul 23, 2017


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Posted on Jan 02, 2017

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SOURCE: my 2002 suburban will not start

I had this same problem and also heard the relays clicking. This was due to a poor connection to the battery. I tightend cables at the battery and solved the issue. NO problem since. This also happend about three weeks after I changed my battery,

Posted on Dec 25, 2008

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SOURCE: possible bad alternator?

I went through three alternators before we found a good one for our saturn sl2. Now she has been good for two years. All I did was go back to where we bought it from, they hooked up the alternator to a machine and gave us a new one when it read that it was faulty.

Posted on Apr 13, 2009

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SOURCE: New battery but still acts dead - Does computer need to be reset?

do not suspect computer.
1 the new battery may not have been charged from the store so would need to be charged before use, charge new battery on a charging set and see if this resoves the problem. *or use slave leads and start from a second vehicle)
2 your alternator may not be charging the battery so after a while it will just die. use a volt meter and check that volage is increaseing to your battery when the engine is running.
if not suspect alterantor defective and may need replacement.

Posted on Nov 13, 2009

  • 7 Answers

SOURCE: 2002 Chevy s10 electrical problems

Not to well versed on the S-10 electrical system but I would take a look at the voltage regulator.
It sounds like there is a malfunction that charges your battery sometimes but shorts out the alternator other times. Try having it tested or replace it
WD-40 will not do the trick for cleaning your terminals. WD-40 was developed during the 2nd WW to combat moisture in radio equipment in the South Pacific. WD stands for water displacement and the 40 is for formula #40. To clean the terminals you must disconnect them and use an abrasive such as emery cloth to remove the corrosion. They should be brite and shiny when you put them back together. I always cote mine wit dei-electric grease before re-assembly

Posted on Nov 21, 2009

  • 2 Answers

SOURCE: the battery goes dead and won't start even after

battery went down and was replaced. Air conditioning had problems as well as display screen. car ran well but next day battery was dead again. What now?

Posted on Aug 10, 2011

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2 Answers

Charging system failure in mountaineer

Sounds like the alternator died. happened to me yesterday.

Apr 17, 2012 | 2002 Mercury Mountaineer

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2002 Mercury mountaineer wont crank... all lights turn on but nothing just changed the starter, has a new battery, what else could it be? i know its either locked through the theft or a sensor, please...

Make sure you are getting power to the starter before you say its the anti-theft

It could be improperly hooked up starter or a bad cable to the starter

Aug 21, 2011 | 2002 Mercury Mountaineer

1 Answer

2002 mercury montaineer , battery light comes on , they gages shut down couple minutes after then the truck acts like it gonna shut off....when getting a jump, the truck fires right up, couple minutes...

Your battery is definitely low. First clean the terminals on the battery and the inside of the terminal rings on the wires. If you have a slow charger put it on that overnight and see if it holds a charge. If it still keeps depleting or doesn't charge overnight then either your battery or your alternator are done....possibly both. So take the battery to have it load tested. Most places that sell them can test them. If the battery is done replace it then test the battery with a volt meter. If the old battery is still good put it back in the vehicle and test the voltage with a volt meter. With the engine off the voltage should read 12 volts (once its fully charged or if its new) with the engine running it should read around 14 volts. If it is way higher than that or it doesn't go up at all your alternator requires replacing. Alternators are fairly easy to replace but if you don't feel comfortable with that take it in to a mechanic.

Jul 25, 2011 | 2002 Mercury Mountaineer

1 Answer

We turn the key and we get nothing! If you hook jumper cables up to the battery and to another vehicle, then it will start after a few minutes. The battery is brand new, and we just put a new starter on...

Brand new battery or not, from what you describe, it is clearly flat.

Only 2 possibilities here. Either the new battery you bought is defective (Its very rare, but it hapens) or the charging system on your vehicle is faulty and the battery isn't getting recharged.

If you have a volt meter, then test the battery when the engine is running and see what the voltage is, if it's as poorly charged as you have described, the voltage should drop slightly when you turn the engine off.

A very easy test of the charging system if you can't find a volt meter is to sit in the car with the door open, start the engine and watch the interior light as you turn on every electrical system in the car. If the interior light dims then you have a charging problem.

Jun 30, 2011 | 2003 Mercury Mountaineer

1 Answer

My 2002 Mercury Mountaineer, which I don't drive very often, does well- as long as I drive it at least every 3-4 days. If I don't the battery is dead. It has a new battery in it (battery is fine). Any...

Something is drawing power while the car is not running, and it could anything from interior lights remaining on to a defective main computer in the car. If you want to try a hit and miss analysis you can remove all fuses from the fuse box, then re-install one every couple of days. If the vehicle starts ok, install another fuse, and so on until you find the circuit that's drawing power. This could obviously be a time-consuming task, or you could be lucky with the first fuse. HINT: start with fuses such as interior lights, stereo, etc. The other solution is a bit costly, but it will yield a quick fix -- take it to the dealer or a reputable garage in your are for an electrical check.

Dec 19, 2009 | 2002 Mercury Mountaineer

1 Answer

Major Power Problem with 03 Mountaineer Premier

Have the battery tested, perhaps the alternator also. I had the same problem on my 2005 Taurus ( also a Ford / Mercury product ). I replaced the alternator easy enough, and a full charge on the battery solved the problem. The vehicles are designed to shut down unnecessary or non-vital accessories first, as to prevent a major shutdown on the road. So your lights and signals will still work, but the rest of the electrical will power down to conserve the battery.

You can get the battery tested at most service stations or you can buy a tester at any auto parts store. Some of them will test it for free.

Hope this helps.

Jan 27, 2009 | 2003 Mercury Mountaineer

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