Also clean your battery connections and make sure they are tight. Check the wires at the alternator make sure there tight and not burnt. The main wire to the alt tends to get very hot and brittle if slightly loose.
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Could be a bad battery but I suspect your battery cable is either loose or corroded or dirty. Before you pull the battery disconnect your battery cables and clean them both ends and when you put them back on make sure you have good connections and tighten good.If that does not work pull your battery and get it tested at a battery out let . they should do that for free.
remove negative cable from battery, hook up a test light to the negative terminal. opposite end to negative on battery. start pulling fuses, when the light on tester goes out. thats the bad curcuit that is draining battery. wait about 3 minutes before pulling fuses. Good-Day!
remove your negative battery cable insert a 12 volt test light between the post and cable you should see the lamp light this is your short. pull fuses until the light goes out the circuit on that fuse is running down your battery if pulling all fuses does nothing replace your alternator; the altenator diodes are bad
sounds like you have a draw put a test light between the the positive post on your battery and the cable if the test light goes on then something is not turning off pull each fuse one at a time till the test light goes out when it goes out that is your bad circuit be sure to replace each fuse after you check to see if the test light goes out
It sounds like your battery is not charging. You may have a good battery and a good alternator but what you need to look for is the alternator fuse . It is usually a square block style fuse , 50 to 80 amps, normally in a fuse box under the dash. If it blows the car will drive till it runs out of battery juice and go bonkers just like you describe right before it dies. The charge light on the dash usually will not warn you of the problem. I think the manufacturers just want to charge you big dollars just to replace a fuse most people are not familiar with.
Pull the neg. battery cable off the battery and connect a test light between the neg. cable and the neg. battery post if there is a draw it will light up. Make sure the doors are shut and ign. is off and start by pulling the fuses one at a time to see if the test light goes out(making sure to replace each fuse before moving on to the next one) if the light goes off then you have found the circuit that is pulling the draw, once you narrow it down it should be pretty easy to find exactly what is drawing the battery down.
If your battery has any considerable age on it,( 2-5years), it could indicate a dead cell in the battery. If you installed an other than factory stereo then you could be getting drain there. If the battery is new, then check your battery terminal connections ensuring they are clean and tight. Also, check your battery cables to ensure they are tight at the engine block and at the starter. You might as well while you have the hood open, check the alternator connections for loose or corroded plug or fasteners.
Obvious that something is drawing down the battery...Put a test light between the negative cable and the negative post of the battery (remove cable first) start pulling fuses till light goes out. That will tell you what system is drawing...you can then begin looking for the actual problem. If all fuses pulled and light remains on ,chances are you have an internal alternator problem.