Question about 2004 Mercury Mountaineer

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Drains battery new battery but still have to use cables

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It could be the alternator

Posted on Oct 30, 2012

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Posted on Jan 02, 2017

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New battery - battery is drained in the morning.Replaced voltage regulator. Disconnected aircon. Still drains overnight. Ute will start and run with full battery but it drains overnight.


Easyest thing to do is pull one cable off your battery. Start pulling fuses and each time touch the cable to the battery post. When you find one that reduces the spark drastically that is the circuit to investigate.

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New battery but something keeps draining it


Are the battery cables tighly fit to the battery posts?
And do they fit snugly?
Mine kept coming shaking loose when I drove and when I parked the car for a while, dead battery when I came out.
The cables that connect to the battery posts did not fit well.

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Battery draining overnight,replaced with new battery now starting


Disconnect any one of the cable from battery (either + or - ) and in series with battery connect a 12v bulb of low wattage say 5w or 10w. By connecting in series I mean one wire of bulb goes to disconnected battery cable and the other wire to the terminal of battery from where you disconnected the cable.

Now observe the filament of bulb, if it glows then your battery is draining due to short in your vehicle electrical system. You need to locate this short circuit and fix it, otherwise your new battery would also drain.

Let us know what you found out.

May 05, 2014 | 1990 Ford F150

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I have an 81 Toyota pickup 2wd 22r 5 speed that keeps draining the new battery. It has a new alternator, new battery, new starter, and new voltage regulator. The headlights sometimes pulsate brighter when...


I had one of those the alternator on that one should be 50 amps! if less than that you have the problem your facing now,might be the wrong alt. have it checked for amp output, good luck,Gary

Oct 28, 2013 | Cars & Trucks

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My 77 coupe deville keeps draining the battery.i got new battery I got new battery post .i did not change the alternator because when I take the - cable of the battery my car stays on..can someone please...


To begin with, please don't ever disconnect the battery cable with the engine running. You can cook the alternator and the computer.
Have you pulled the fuses and disconnected everything to check for a drain ?

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1999 durango won't start


starter?
New battery drained = something is still powered, open/short.
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Jan 19, 2013 | 1999 Dodge Durango

1 Answer

BATTERY IS DRAINING EVEN WHILE CAR IS NOT IN USE


I stated "such as a light " there are many, many other causes of 12 volt drains such as a seat switch that might hang up and stick. Empty that battery overnight. First install a 9V Battery Radio memory / and clock or you will have to reset both. Disconnect BLACK negative cable of battery. Using a 12V testlight, connect one end to the disconnected cable, and the other to the negative battery terinal. It should light. Remove the 20A BODY and LIGHTER fuse first . This will eliminate the courtesy light circuit . If light goes off the drain is on that circuit. STILL LIT ? drain is on another circuit. Start by eliminating fuses. Hope this helps.

Apr 12, 2009 | 1995 Cadillac DeVille

1 Answer

1998 Corvette drains the battery in less than 2 days.


No, corrosion will not cause a battery to drain, even if the corrosion is on the terminals. Several factors can cause battery drain, I would first have the battery tested to see if the battery it self is not bad. If the battery is good, then the most common is a short. All most all new cars have a certain amount of drain,(measured in milivolts) this drain is for clocks and computer memory's, and it would take several days of a vehicle sitting for the battery to be drained. Don't immediately assume you have a problem if you see 2-6 milivolts of drain on a battery with the key out, now if your battery is being drained after being parked over night, you have a problem. The easiest way to pin down the problem short is to disconnect your positive battery cable from the battery, take a 12 volt test light and clamp one end to the positive cable, and hold the probe to the positive post. Now if you have a short the light will come on. Have someone help you by pulling the fuses one at a time. If when a fuse is pulled the light goes out you have isolated the short to that system. If you pulled all the fuses and the light never went out try disconnecting all the wires from the alternator, 9 times outta 10 do this will let you know where your short is. If the system is not critical like power locks some people just leave the fuse out. 

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The battery keeps draining and it sort of stutters when i go to turn on the engine. It charges right back up when i jump it but the minute i turn off the car the battery is drained again. the battery light...


This may be over-simplified, but to find the battery drain: Remove the positive battery cable from the battery and insert an ammeter in series beween battery and cable. If something is draining the battery, it will show on the ammeter. Remove fuses one-by-one until you see a substantial reduction in the ammeter reading. That will pinpoint the circuit that is draining the battery. Then troubleshoot until you find the faulty component, wiring harness, etc. Remember there will always be a little bit of drain because of ECM, BCM, radio memory and stuff like that.


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1 Answer

Battery draining fast


I would check the alternator again, it apparently isn't charging the battery with engine running. You need a volt meter or amp meter to test this. Also does the battery discharge when the car is not running?

Aug 07, 2008 | 1992 Ford Tempo

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