You must have a parasitic draw, something is drawing power even when key is turned off, could be something stupid like a bare wire grounding out, or also could be something not very obvious and hard to find, you may need to bring it to an auto electrical expert if you can't find anything wrong with any wires under the hood compartment, check wire connections for debris or water in plug-ins, loose, stripped or frayed wires. Also check head and tail light sockets for water or debris.Other than that you may need the help of a professional to chase down the draw
Sounds like some thing is on .check to see if your brake lights are staying on,because of a broken brake light switch. check dome light, check glove box light,parking lights,and try not setting your alarm over night. you have a 12 volt drain some where in the car.
SOURCE: dead battery
First thing check you cigarette lighters make sure none are stuck push in or bad. If you do not find any problems there, then you can try taking you negative battery cable off and placing a test light in between the cable and the battery post. You will want to pull out one fuse at a time. Watch your test light; it should get real dim when you find the right circuit that is causing the pull on the battery. The light will not go completely out unless you pull the fuse that carries the memory for the radio out, then it my go out all the way out. There usually is a small amount of voltage being use because of the radio but that will not cause the battery to go down. The battery can carry that. This is the easiest way I can tell you. There are other things you can try but they require special equipment most people don’t have or the knowledge to read wiring diagrams. Nor do they have a working knowledge of electricity to trouble shoot this kind of problem. If you can by chance find the circuit that is causing the voltage draw then you might find the wire or component that is causing you your problem. Look for wires that may have bad spot in them form rubbing on something and laying on metal. If you cannot find it by doing this you will probable have to take it to a shop.
P.S. you don’t have a big amp in this do you because they will kill a battery in about 5 minutes, if you are playing it without the engine running.
SOURCE: 95 jeep grand cherokee laredo
the best way to look at this problem is with a12 volt test light then remove the ground cable from the battery turn every thing off inside the car close all doors and remove keys then connect testlight to battery cable and touch the test light point probe to the negitive battery post if test light lights up for more than three seconds and stays on you have draw on the system. dont panic it maybe just a glove box light or door switch. if suspect a circuit simply un hook it retest again .if you open a door that will make light test come on recheck all doors closed. if you still have test light on locate fuse box and remove one fuse at a time until test goes out while holding door switch in.when locate circut use wiring diagram to assist from ther. if the light does not light up check altenator output volt meter shoud be 13.2 -15.5 volts when running.
SOURCE: I HAVE A 94 JEEP
Check the Belt Tensioner. If the Tensioner is not Keeping the Belt Tight it will Drain the Battery Pretty Fast.Please Rate my Response, I need all the Help That I can Get! Thanks!
SOURCE: new alternator, but the battery keeps dying.
If you have one where the voltage regulator is located inside (integral part of) the computer...I believe you know that already.... Then you will have the symptoms you have posted. There is a "work around" for that involving the use an an older style regulator but I can't remember the exact wiring hookup. Best, just get another computer from a scrapyard.
Likely the computer is not getting sufficient voltage and that's why engine performance is off a bit. After installing the computer, fully charge the battery before starting it to avoid overloading the charging system and causing it to fail again.
SOURCE: The battery on my grand cherokee goes completely
Do you have an alarm? It's common for them to pull too much current and drain the battery. Also look for lights such as dome lights or brake lights stuck on that could drain the battery. Are all the wires to the alternator and battery connected?
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