I'm writing with concern regarding a significant draw from the battery as it goes dead overnight. There is a factory installed alarm system on my car and it has been suggested that it may be the problem; however, I would like your opinion on any other possibilities of where to search.
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You have something draining the battery. You will need to try to isolate what is drawing the electric while it is parked. Try pulling out a few fuses every night until it stops going dead. Then you can narrow it down which circuit has the fault. Try the radio, alarm system or interior light fuses first. Write down which fuses you pull out so they can go back where they belong. Good luck!
You have a parasitic drain, something is on a light or a module isn't powering down . To test this you put an ammeter in series with negative battery cable an battery post . Measure currant draw ,shouldn't be any more then 0.050 milliamp's . If it is start pulling fuse's till it drops . You should refrain from taking the battery cable off with the vehicle running , Can cause a voltage spike , take out electronic components . Namely transistors . http://www.troubleshooters.com/dont_disconnect_battery.htmHow To Perform Parasitic Draw Test EricTheCarGuy
WEll, something is causing the issue.... First, fully charge the battery, then disconnect the negative and put a volt meter or test light in series (between the terminal and the cable). Disable interior lights, and test for draw of current.
Essentially, if the light lights, too much current is being drawn out of the battery. So, you disconnect fuses, and other items until the light goes out. This should help you find the offending component.
IF no light lighting, perhaps the battery itself has issues. Leave it disconnected overnight, and see if it is discharged...If yes, the battery would be suspect.
There are diodes in the alternator that fail and can cause voltage to be drained. Some tests to the alternator fail to reveal the fault. the best test is an Scope, but you can isolate diodes and test with continuity tester.
unhook battery positive and install test light in between the post and the cable. if it has a draw it should come on dim. then unplug the fuses one at a time and when you pull the fuse and the light gose out thats the circut with the draw. then refer to what that fuse runs and correct the problem by inspecting that part and repairing as needed.
How long does it take for the battery to go dead, overnight, couple of days?
Have you checked the electrical system for draws? You'll need a multi meter capable of reading amperage. Disconnect the positive cable and hook the meter up in series with the battery and the positive cable. You want to make sure the key is out of the ignition, all the doors are closed and all the dome lights etc are turned off before doing this. If you get a reading of more than .050 amps than you have a draw. You may have to wait for 20 minutes or so for everything to power down to get an accurate reading.
If you have a draw of more than .050 amps than you can start pulling fuses one at a time until the draw goes away and then focus on the things that fuse supplies power to. Make sure you put the fuse back that you pulled out before pulling the next.
If there are no draws and the battery goes dead overnight disconnect the battery, let it sit overnight and then see if the battery will start the vehicle in the morning. Every once in a while you will run into a battery that has an internal draw and will run itself down all by itself.
the cause of your concern is a defective brake pedal switch. Of course the correct operation of this switch is responsable to activate the brake lights but it also activates an interlock mechanism in the shift column, so you cannot put the lever out of P position without stepping on the brake pedal. This is meant as protective system to prevent the car from moving accidently.
Either something is draining the power or your alternator is not recharging your battery. Do you have a DC voltmeter? With the engine running check the voltage accross the battery it should be about 14 volts. If it's down around 12.5 volts with engine running the alternator is not working. If you determine the the alternator is working and the battery goes dead, then there is a draw on the system. It could still be the alternator though, there are diodes in the alternator, a diode acts like a one way gate for electricity. With one bad diode the alternator will still work but, when you shut the car off the alternator drains the battery back down. Something is drawing it down, without testing equipment, you'll have to take it to a shop. Something you could try, after the car has been shut off for while, an hour or more, go feel if the alternator is warm or hot, if so it's drawing the battery down. Disconnect the battery overnight so it doesn't go dead on you.