Question about 1993 Buick Park Avenue

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Battery is draining overnight even with negative terminal unhooked

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A cell inside the battery is shorting out,replace the battery.

Posted on Aug 25, 2010

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Posted on Jan 02, 2017

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On a 2004 Buick rendezvous there is a little red light that keeps blinking expect when the car is running. I'm pretty sure its draining my battery. Any suggestions?


That little red light is your anti-theft system and it does not drain enough power to drain your battery unless your car is sitting for a year. I would check for a draw. Unhook your negative battery cable and hook a test light between the cable and the negative terminal. If the light lights up brightly, then you have something draining the battery at a significant rate. I start by unhooking the main cable off of the alternator, this is a prime place to start for a battery drain. If unhooking the alternator does not dim the test light then move on to the power distribution center and pull fuses and relays one at a time until the light dims, this will at least narrow down the circuit that needs attention.

Feb 25, 2016 | Buick Cars & Trucks

3 Answers

Battery drains overnight


Car And Deep Cycle Battery

Frequently Asked Questions

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What causes my battery to drain overnight? Parasitic (or ignition key off) drain is the cumulative load produced by electrical devices, for example, emissions computers, clocks, security alarms, radio presets, etc., that operate continuously after the engine is stopped and the ignition key has been switched off. Normal parasitic loads are below 75 milliamps (.075 amps). When the parasitic load is greater than 75 milliamps (.075 amps), batteries will drain more quickly. Glove box, trunk, and under hood lights that do not automatically turn off when the door is closed or shorted diodes in alternators are the most common offenders. Cooling fans, power seat belt retractors, radios and dome lights left on, alarm systems, and electric car antennas have also caused batteries to drain overnight. Leaving your headlights on will generally discharge a fully charged car battery, with 90 minutes of Reserve Capacity (36 amp hours), within a couple of hours.

It is highly recommended, especially if you are using a sealed wet "Maintenance Free" (Ca/Ca) battery, that you allow it to thaw if frozen, fully recharge it in a well ventilated area with an external battery charger, remove the surface charge, and load tested both the battery and the charging system for latent damage from the deep discharge. You could have a damaged or bad battery. If the alternator is warm and the engine is cold, then check for a shorted diode in the alternator.

Below are some methods that are used to test the parasitic load with the engine NOT running, under hood light disconnected, all accessories switched off, and the vehicle doors closed:
  • Connect a 12-volt bulb across the positive and negative battery terminals to test the bulb and the battery. If it glows brightly, then remove the negative battery cable and connect the bulb in series between the negative battery cable terminal clamp and the negative battery terminal. If the bulb continues to glow brightly, then start removing fuses or connections to the positive battery post one-at-a-time until the offending electrical component is identified by the bulb dimming.

  • A better approach is to use a DC ammeter, for example a Fluke 175, inserted in series with the negative battery cable terminal clamp and the negative battery terminal or a clamp-on DC ammeter, like a Fluke 336 or i410 around the negative battery cable. Starting with the highest scale, determine the current load. If the load is above 75 milliamps (.075 amps) after the initial surge, then start removing fuses or connections to the positive battery post one-at-a-time until the offending electrical component is identified by the parasitic load dropping to within 75 milliamps (.075 amps).

Oct 17, 2015 | Cars & Trucks

1 Answer

Drains battery while sitting


Here is how to detect a drain in system! Use a test light, Hook up test light to the negative terminal on battery. ( unhook terminal first.) connect opposite end of test light to negative on battery. If a drain, light will be on. Start pulling fuses from fuse box. when the test light goes out, that is the problem curcuit. let sit 3to5 minutes before pulling fuses. Good-Day!

Aug 07, 2014 | 1986 Ford Mustang

1 Answer

1083 plymouth reliant wagon battery dies when sitting overnight


unhook the digital clock & see if you still have battery drain. If not, that is your problem

Apr 21, 2014 | 1983 Plymouth Reliant

1 Answer

How to fix an electrical circuit fault on peugeot 307


How To Test For A Car Battery Power Drain
Hi , A fully charged battery is 12.6. The link below is a short you tube video on how to find out if a car battery has a power drain, The video starts with the guy loosening the negative lead to the battery then turns the multimeter on and sets it to 20 DC, plug bottom of lead to current mode and places 1 multimeter lead on top of the terminal inside the negative lead and the other multimeter lead on the negative lead and wiggle the negative lead off the battery, The current being drawn from your battery should be less than (5.0) 50 mille volts..... The reason he takes the negative lead off after connecting the multimeter this is to save any codes from the car as technically the battery isn't disconnected..... CHEERS..
How to Find Car Battery Drain

Diagnosing car battery that drains overnight

Nov 08, 2012 | 2005 Peugeot 307 1.6

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

2000Silverado 5.3 Battery light is on in the morning, volts read 11 or 12 normaly read 14,after running a while it goes to 14, twice it feel below 5 volts battey went dead, got new battery,gheck grounds,...


Something is draining your battery overnight and once you start running it, it recharges your battery. If you have anything plugged into your cigarette lighter, unplug them. Unplug anything that you can, like if you have an amplifier for your stereo or anything else. Tonight unhook your negative terminal, and then hook it up in the morning and if it is ok, then you know that is definitely your problem.

Dec 03, 2010 | Chevrolet Silverado 1500 Cars & Trucks

1 Answer

Battery draining when engine is switched off


The negative terminal is the earth
The larger cable is for the engine earth so the starter will work, the smaller one is the body earth, The car needs both for the electrics to work, If you disconnect the small cable the electrics may earth back through somthing else like the throttle cable and this will not stop the battery drain

May 16, 2010 | Renault Sport Cars & Trucks

1 Answer

1997 Toyota Camry XLE has an overnight parasitic battery drain-I suspect the factory installed anti theft system. can this be diabled?When I remove - terminal over night and replace in the morning, car...


This should be done with everything turned off and the door closed. with negative battery disconnected. place 12 v test light between the battery terminal and the cable end.(on neg. side) if the light lites up there is a drain. remove one fuse at a time until u see the lite go out. that is the sytem the drain is on. usually glove box light or trunk light or visor light left on or stuck on.

Feb 17, 2010 | 1998 Toyota Camry

2 Answers

Something is draining my battery overnight already tested battery starter altenator cellinoid


Hi there,

This response contains troubleshooting procedures designed to locate the cause of an overnight power drain resulting in a dead battery, It assumes the charging system is working.

The first (and easiest) test I run is on the battery.

When you are done using it for the evening, pull the Negative battery cable.

In the morning, re-connect it. If it's dead again, the battery need replacement. This does not necessarily mean you found the problem.

If it starts, the battery is ok. It's time to look for the power drain.

With the ignition off, ensure the systems that should be off actually are off. For example: does the radio still come on? Wipers? Etc.?

In the same vein, has anything new been installed lately?

The next test is a lot more tedious. You will need a test light, needle nose pliers (to pull fuses) and the proper tools to remove the negative battery terminal (again).
  • Ignition off
  • Remove the cable from the Negative battery terminal
  • Hook one end of your test light to the Negative battery post
  • Attach the other end to the cable you just removed
  • Again, double check connections to recent installations (radio, GPS, etc)
  • If it lights up very faintly, this is likely the normal drain of the clock. The brighter the light, the bigger the drain.
  • Find your fuse box
  • While keeping an eye on the test light, pull the fuses one by one. Replace the one just pulled before going to the next.
  • When the light goes out (or dims), you will have narrowed the the problem to a specific system. Check the legend on the fuse box for the offending fuse.
At this point there are too many 'What if's'. Which system has the drain will determine the next steps to be taken.

This procedure will allow you to focus in on the problem area. Let me know what you find out.

Hope this helps

Mike

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Jul 24, 2008 | 2002 Ford SVT Focus

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