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Electric current drains when running and car powers down

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  • Lincoln Master
  • 1,311 Answers

More than likely your alternator is defective, do you have any indication on your dash display that there is a charging problem?

Posted on Sep 11, 2010

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Posted on Jan 02, 2017

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Nissan maxima 2002 battery drains overnight. auto electrician found the FL40A fusible link power windows to be the problem. when the FL is removed the battery doesn't drain


If your car has self closing windows when the car is locked or automatic open/close, it is possible one or more window motors is not switching off as it should leaving it stalled and consuming current.
I once had a Vauxhall do that..

I suggest you insert an ammeter in series with the fusible link and measure the discharge and compare it with a window motor stall current...

Mar 07, 2017 | Nissan Cars & Trucks

1 Answer

The IOD is pulling 2 amps n draining battery over night. What can I do to correct the problem???


Testing for Battery Drain - Randy's Repair Shop

randysrepairshop.net/testing-for-battery-drain.html
Instructions for measuring automotive battery current drain. ... Excessive current drainwill usually result in the battery running down overnight or within a few days. ... Many digital meters have a 2 amp internal fuse that may blow if multiple ... If pulling fuses and circuit breakers doesn't stop the current draw, you'll need to look ...

How do you trace a drain on the battery of your car with an ...

www.instructables.com/.../How-do-you-trace-a-drain-on-the...

InstructablesApr 13, 2011 - I know this is an old question, but I that if the battery cable is not clean or .... I wish I could find one of those 14.4 Vdc 2 Amp solar chargers. ... be to pull a different fuse every night (not the ones which would require factory help ... As others have pointed out, the LED will not drain a good car battery overnight.

Diagnosing A Car Battery That Runs Down

www.aa1car.com/library/battery_runs_down.htm

Jan 05, 2016 | Cars & Trucks

2 Answers

Hello! I have a s500 2001Benz and our battery keep dying overnight why is this..


You have an excessive power drain from some electric component in the car and it is draining the battery power rapidly. That is, assuming you have a sound battery that is holding its charge.

You need to have some tests run to identify the source of the drain and rectify it. You will need to either have Mercedes do this or a competent auto electrician who is familiar with Mercedes systems.

The battery will not last very long if it is being constantly discharged like this due to the excessive power drain.

Furthermore, if the battery is old and on the way out it will not hold its charge for very long even if there is no excessive power drain. When the car is idle and everything is in working order, there are still systems on the car that drain a small amount of power constantly so you still need a sound well charged battery.

Mar 10, 2015 | 2001 Mercedes-Benz S-Class

1 Answer

Write the differences between alternating current (AC) and direct current (DC).


I will try, but understand, though we can harness electricity for power, there are still mysteries surrounding the existence and interaction of electric charge.
Alternating current is an electric current that reverses direction at regular intervals. All household current is alternating current. That is how it is generated through power lines, our electric grid, from the source like hydroelectric dams through power lines and into our homes.
Direct current is electric current going only one way in a wire or circuit. Automobiles run on direct current. Science says the flow of electrons in direct current only travels one way. Alternators in cars start out producing alternating current, but with an electric device called a diode, the current is changed to direct current. A diode will only let current pass through it in one direction, but stops current flow in a reverse direction. Before the invention or discovery of alternators, cars used a belt driven generator to produce direct current. Alternators proved superior in generating electricity, however, so were adopted by auto makers.
Now purists will add something more: by convention we say that current flows from the positive battery terminal, through the wire circuits, through an electric motor, and then to ground and thus back to the negative terminal of the battery. So from positive to negative, right? Well, electricity is a negative charged electron flow through a wire, so purists say the current flow is actually from the negative battery terminal through the wire circuits and back to the positive battery terminal. It is confusing, so by convention we say (DC) current flow is from positive to ground, or negative.
Well, there you go. Is it crystal clear, or whut??? Lol.

Nov 08, 2013 | Cars & Trucks

1 Answer

I turn car off and something keeps running sounds like /fan/electric motor drains my battery.


When you switch off pull the fuses out one at a time to isolate the guilty circuit that is running on after shut down. There are are only a few circuits that are powered when the car is off (alarm, interior lights etc.) so you will need to check if there is short or switch malfunction that would allow the power drain.

Feb 21, 2011 | Mercedes-Benz CL550 Cars & Trucks

1 Answer

I have 2005 Chrysler Voyager - battery flattens overnight, and will not start. I am doing short journeys which I guess does not help. Nearly new battery, charging system good, and nothing apparently using...


The battery will not discharge unless there is a drain. When the car is shut down disconnect the negative battery terminal. Put a DC ammeter between (in series) the battery negative terminal and the disconnected cable. The drain due to electric clock and immobiliser circuit will be in the order of 30mA (0.03 Amps). Remove each fuse in turn and note any drops in the current drawn. At some point you will encounter a fuse which when removed drops the current drain, it is this particular circuit that is primarily the cause of the battery discharging and it will need closer inspection to detect the fault within it. If you can leave this fuse out to prevent battery discharge.

Dec 05, 2010 | 2004 Chrysler Voyager

1 Answer

Is there a way to disable the alarm to see if that's draining the battery on a 2000 740i?


No not unless you want to mess with he wiring which is not advisable as you are just guessing what the issue might be. The alarm and other systems are not designed to draw enough power to drain the battery unless the car is idle for a few weeks or more.

The best thing to do is to get the car to a reputable auto electrician so he can test which functions on the car are draining the battery beyond normal current draw when the car is idle.

Have you checked for faulty or sticking power window switches. Just one faulty switch will allow power to the electric motor and the battery will drain virtually overnight.

Do you know if the alternator is functioning properly and supplying power when the vehicle is running? Has it been tested? If it is faulty the battery will be drained when the car is operated.

If you retain this brand of vehicle I'm afraid you can expect to experience quite a few electrical problems.

Sean
Voluntary contributor.

Dec 14, 2009 | BMW 750 Cars & Trucks

1 Answer

Have tried 2 new batteries. car starts at once. runs smoothly. but when ignition is switched off for about 30 minutes, the battery goes dead! The alt. has been checked OK. The problem started when we...


The cause is most probably a current drain on the battery when the vehicle is switched off.

Check for a drain current from the battery while the vehicle is standing with engine and all electrical system turned OFF -
[ while in this condition, if you don't have a current meter, temporarily connect a small bulb (6-12W) in series with the main battery ground cable - lamp glow indicates current drain - remove fuses, disconnect items to identify cause of current drain],

Also check alterator output voltage (measured across the battery terminals) is approx 14.5V when engine is running and electric system is loaded with headlights or blower fan on.

Oct 28, 2009 | 1994 Toyota Camry

2 Answers

I own a nissan maxima 1997 , there is a problem, there is somthng killing my batterie , i checked all teh lights there is noone of them that stay on, my alternator seems to be cahrging good but i found...


The battery should never be disconnected while the motor is running - this can cause excessive voltages to appear on the alternator output.
That in turn could cause destruction of any electronic module on the vehicle, including damage to the alternator itself.
Assuming the electrical system has not been damaged, the cause of your discharge problem is most likely a current drain on the battery when the vehicle is unused.
Check for a drain current from the battery while the vehicle is standing with engine and all electrical system turned OFF -
[ while in this condition, if you don't have a current meter, temporarily connect a small bulb (6-12W) in series with the main battery ground cable - lamp glow indicates current drain - remove fuses, disconnect items to identify current drain],

Also check alterator output voltage (measured across the battery terminals) is approx 14.5V when engine is running and electric system is loaded with headlights or blower fan on.

Oct 20, 2009 | 1997 Nissan Maxima

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