Check earth connection. Sometimes if wires aren't connected right, running the car will discharge the battery instead of charging it... ----------------------------------------- Check for a current draw by disconnecting the negative cable at the battery and hook a test light between the cable and the battery. Remove fuses until the light goes out. While doing so remember to depress the door jam switch as it will show a current draw.
Had the same problem. Bought a re-conditioned alternator, turned out it was bad. Usually if battery draining, it's alternator or battery or both.
A slight possibility but not likely
Defective alternator, loose alternator drive belt, dead cell in battery, or something is on pulling power from the battery.
Then either something is on draining the battery or the battery has a dead cell draining all the rest and must be replaced.
Could be a faulty thermostat switch in the radiator !!
Yes. Otherwise you will drain the battery through the ignition points, burning them out prematurely or even welding them together.
depending on the year I have had issues with a 1990 and a 1992 grand caravan problem was the light in the glove box the contact would turn the light on periodically draining battery
A short will not drain the battery it will blow a fuse. It may be the battery has a dead cell, or some light is on draining the battery. It can also be a stuck relay.
Dead cell in the battery, or something is on pulling power from the battery. Any light on the vehicle or any relay that is stuck. I am assuming you have checked the alternator and it is good.
Something is on draining your battery overnight. Any light or any relay. It can also be your battery has a dead cell draining it overnight.
If your battery is good and you know your car is draining it then yes, disconnecting your battery from your car will keep your battery charged for much longer than 3 days. Your battery should stay charged way longer than 3 days in normal conditions being hooked up to your car. You should get it checked out and figure out what is draining your battery so fast.
You may have an electrical short where there is a bare wire coming into contact with metal and draining your battery or you may simply have a light on that's making the battery's voltage to drop . An experienced mechanic will be able to conduct several diagnostic tests to determine the cause .
There is an easy way to find out what is draining the battery on your car. Disconnect the positive or negative battery terminal. Not both. Connect a test light between the post of the battery to the cable end of the battery. If your car is draining the batt ery the light will show it. To find out where the drain is coming from just pull fuses until the light goes out. Then you will know what is draining the battery by the function of the fuse you just pulled. For example, if you pulled the fuse for "radio" and the light went out you would know the radio is drawing the current off your battery.
Possible open circuit from the starter relay or solenoid that keeps draining it or some accessory in the car may need lots of power to keep memory function, ex. gps, stereos, DVD players
Can be a dead cell in the battery which means it must be replaced. Can also be something is on pulling power from the battery. Glove box, interior, under-hood, or trunk light. Can also be the alternator is defective.
If the battery is brand-new and I would suspect either the alternator is defective or you have a lightbulb somewhere on the vehicle that is pulling power from the battery. It can also be a relay that is stuck.
you possibly have something draining the battery when the car is shut off, with the car shut off pull the positive cable off the battery and then just touch the cable to the positive post of the battery and see if you get a spark, if you get a spark you have something electrical draining the battery.
There is a circuit live somewhere.
Are the battery wires corroded? If they are, they may not be getting a good connection.
most of the time the diode circuit will burn out trying to keep a defective battery charged, which results in overheating or increased amperage for the charging circuit which includes the diodes.
many things can do it suck as junk battery, junk alternator , or leaving anything on in the car
Something is on draining the battery or it has a dead cell and needs replacing.
A partial earth
you can avoid draining the good battery
Best guess would be that you have a short to ground somewhere that is draining your battery.