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What causes the battery to drain ..new alternator and battery. 2000 mountaineer

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  • Cars & Trucks Master
  • 5,631 Answers

Probably you have an electric component of your car making short - circuit. Only wat to detect is doing an electronic test.
Also it might be detected by scanning computerized system but you need the electronic equipment so should find a specialist.,

Posted on May 02, 2015

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Posted on Jan 02, 2017

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SOURCE: Something is draining the battery on my 2000 Jeep

Put a volt meter across the battery terminals while the vehicle is running. You should read no less than 12.5 volts at idle with no accessories running and no less than that with accessories all on. Normal volts should be around 13.5. Aside from slight fluctuations, the voltage reading should not steadily drop, regardless of how long it is running. I doubt if you have a system drain if it's shutting down while driving...the alternator would compensate for that. Some charging systems incorporate the voltage regulator into the computer. If the alternator checked good by itself but the tests I recommended show otherwise, likely your problem is with the computer.
If the engine does not need to be jump started after it shuts off, you may be looking entirely in the wrong place...but you didn't mention that part!!

Posted on Oct 21, 2009

Testimonial: "Very helpful. The voltage meter read 12 and then 14. The shop I called suggested that it may have something to do with the sensor. Taking to shop"

SOURCE: tHE BATTERY IS DRAINING OVERNIGHT. ALTERNATOR IS

If the battery is draining at all ,beyond 40 milli amps continuous,which is what keeps the radio clock,pcm (computer) and other devices powered up,then something is not timing out,such as windows,door locks,on the LS the radio etc. Retained memory is just that or it goes to sleep ie no current flow. I won't go into how you check current flow but it is fairly easy. The time consuming task will be to find the offender. You could pull all the fuses and replace them one at a time,but need an ampere meter in the circuit,so that's why I won't go into it. Now fuses alone are just a start and time here is limited. The LS has an awfull lot of stuff. I have a 2004. Even the Alt and a long list of things could cause this.

Posted on Feb 11, 2010

  • 14036 Answers

SOURCE: my kia keeps dying! 2000

WHEN TURN OFF CAR CHECK TO SEE IF RADIO TURN OFF.CHECK TO SEE IF INTERIOR LIGHTS OFF.MAKE SURE HEADLIGHTS TURN OFF.IF ALL LOOK GOOD.YOUR POWER DOOR LOCK FAULTY DRAIN POWER.FAULTY BLOWER MOTOR RELAY DRAIN BATTERY.FAULTY STARTER RELAY OR SOLENOID DRAIN BATTERY.FAULT IN THE PCM WILL DRAIN BATTERY.MANY MANY THINGS WILL DRAIN BATTERY.

Posted on Nov 08, 2010

SOURCE: 2004 mountaineer. battery dies if

You basically said it. Something is probably draining the system. Disconnect the positive lead off the battery and then connect a amp meter in between that lead and the positive post and check the reading. If your over 100 milliamps you have something drawing power somewhere.

Posted on Jan 03, 2011

  • 12 Answers

SOURCE: Battery is new Alternator is

whats the condition of the drive belt tensioner? youll have to check with a volt meter should be anywere from 13.9 to 14.5 v ..if the drive belt is tight and you do not have 14 v at battery ...did you have the battery disconected when changing alt?? did you ground out the wrench and create sparks and possably blow the ALT fuse ?? need some more info..thanks

Posted on Jul 28, 2011

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2000 Chrysler t&c,what causes the battery to drain instead of charging,only when the van is running.


If the battery is draining while the engine is running, I would suspect the alternator is not working properly.

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I have a 2003 Mercury Mountaineer I change the alternator and battery the car cuts off and it flashes real quick on the message center that there's something wrong with the charging system trying to...


Disconnect the battery and charge it; then reconnect the battery. There are 2 systems which can cause this. The antitheft and the battery drain protector.

The antitheft can view a very low charge as an attempted theft. The battery drain protector is an automatic shutout for any circuit that is putting too heavy a demand on the Alternator. This feature can actually disconnect a charging system if it is making the Alternator work too hard.

This is why the battery must be fully charged. Since components have gotten flimsy the drain protector is trying to keep the Alternator from overheating.

Other causes for blinking are reversed polarity and relays that are kicking out due to bad contact points. If there is anyway to borrow a scanner, it may identify the defect.

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Something in the vehicle could be draining the battery. Have you checked for a stuck brake light switch?

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2000 Ford Taurus battery drain while driving. New alternator and battery stays charged in other vehicle. What is draining my battery.


Seen this "mystery drain" many times. Check spark at the battery to see how big the drain is. For this simple test, blow away any (explosive) battery charging fumes. Leave one terminal on and gently touch the other to its post in fairly dark surroundings. Then try it again with the wires taken off the alternator. Your spark is now probably much less. Usually bad diodes leaking electricity backwards through the alternator cause this drain. Replace the alternator or the diode pack inside it. Some mechanics recommend actually measuring the drain.... hahaha. OK whatever.

Aug 14, 2013 | Cars & Trucks

1 Answer

2000 town car. found battery drain on fuse 33, which is radio fuse. whart could cause radio to drain battery?


Seen this "mystery drain" many times. Check spark at the battery to see how big the drain is. For this simple test, blow away any (explosive) battery charging fumes. Leave one terminal on and gently touch the other to its post in fairly dark surroundings. Then try it again with the wires taken off the alternator. Your spark is now probably much less. Usually bad diodes leaking electricity backwards through the alternator cause this drain. Replace the alternator or the diode pack inside it. Some mechanics recommend actually measuring the drain.... hahaha. OK whatever.

Apr 08, 2013 | 2000 Lincoln Town Car

1 Answer

What is causing a power drain on battery i have a new battery and a new alternator installed a week ago and when put on a load tester everything shows good, when car is not running load tester shows a...


You have not told us what type of vehicle it. Please do.
A clicking sound seems like a relay. Open the fuse box and locate which one is clicking the identify it from the labels on the fuse cover. Replace the relay. If the replacement behaves the same then check the component that is supplied power by the relay.

Oct 04, 2011 | 2003 Mercury Mountaineer

1 Answer

Battery is new Alternator is new but, it seems the alternator is not maintaining the battery and the vehicle is running strictly off the battery. 2000 Mercury Mountaineer.


whats the condition of the drive belt tensioner? youll have to check with a volt meter should be anywere from 13.9 to 14.5 v ..if the drive belt is tight and you do not have 14 v at battery ...did you have the battery disconected when changing alt?? did you ground out the wrench and create sparks and possably blow the ALT fuse ?? need some more info..thanks

Jul 28, 2011 | 2000 Mercury Mountaineer

2 Answers

2000 chevy venture new battery and is dead after leaving it parked over night


HAVE BATTERY RECHARGED OR VECHICLE JUMP START.WITH VECHICLE RUNNING MAKE SURE ALTERNATOR IS CHARGING THE BATTERY.ALTERNATOR OUT PUT AT BATTERY SHOULD BE 13.5 - 14.5 VOLTS.IF NOT CHECK ALTERNATOR FUSE.CHECK ALTERNATOR + BATTERY FEED WIRE AND VOLTAGE REGULATOR WIRES MAKE SURE NONE OF WIRES LOOSE BROKEN OR DISCONNECTED.IF ALL IS GOOD AND ALTERNATOR OUT PUT LOW ALTERNATOR FAULTY.IF ALTERNATOR VOLTAGE OUT PUT OKAY. YOUR BATTERY DRAIN PROBLEM COULD BE FAULTY AC HEATER BLOWER MOTOR RELAY.CHECK INSIDE CAR WITH THE IGNITION SWITCH OFF.MAKE SURE RADIO TURN OFF.INTERIOR LIGHTS TURN OFF.HEAD LIGHTS TURN OFF.LISTEN FOR ANY NOISES LIKE BLOWER MOTOR RUNNING, OR FAULTY DOOR LOCK SOLENOID CLICKING NOISE.IF EVERY THING SO FAR OKAY.OTHER POSSIBLE CAUSES BATTERY DRAINING COULD BE FAULTY ALTERNATOR,FAULTY STARTER SOLENOID CONTACTS SHORTING OUT.THE PCM COULD DRAIN BATTERY IF FAULTY.THE NEW BATTERY COULD BE DEFECTIVE.

May 12, 2011 | 2000 Chevrolet Venture

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With new stereo equipment the stereo or radio drains the battery dead


depending on how mch wattage you have to your aftermarket radio you might have to hook it up to an accessory battery separate from the one that runs your car. before you do that tho take your car to an auto parts store that can test your alternator and battery for free. try advance auto or auto zone.

Jul 29, 2010 | 2000 Mercury Mountaineer

1 Answer

I have a 2000 Dodge Durango 5.9l V8 SLT which I have had since new. Recently My battery drained and ended up replacing the battery, and the same problen occured again so I replaced the battery again. I...


Have you checked the automatic tensioner? It sounds like your belt may be slipping, causing the alternator to not charge the battery as quickly as it needs to, which puts a lot of strain on a battery.

I would have the automatic tensioner checked and replaced, and install a new belt.

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