pretty easy really, make sure your interior lights are not turned on. Your headlights control should also be the interior light controller. Turn it clockwise or counterclockwise to turn your interior lights off. You'll run your battery down if you dont
if you can start car pull off the neg battery cable if car stalls its the altinater if it stays running it might be the battery
If the battery is running down if it sits for a long period of time then either something is on that is pulling power from the battery or the battery has a dead cell. Check the under hood, glove box, trunk, & interior lights. Also check the brake lights. In rare cases it can be a stuck relay such as a power window relay. If it has a dead cell the only fix is to purchase a new battery. That one dell cell will continually run the battery down.
A dead cell in the battery will cause it to loose it's charge overnight. The only fix is to replace the battery. Also if something is on drawing power from the battery it will run it down overnight. Look at all lights. Interior, under hood, trunk, give box, brake lights, etc. It can also be a stuck relay.
Lights/radio/etc. left on, door not properly closed or faulty door switch (leaving interior lights on), an alternator or starter leaking current. And probably a bad start of the day.
Make sure you have a good earth ground between the body of the car, the engine block and the battery.
When your lights are on and your engine is not running you are taking the power for your car lights directly from your battery. If you leave them on long enough, you will run down your battery and your car will not start. Then you will need a jump.
make sure the glove box light isn't staying on There is something drawing down the battery - and a common problem is the door ajar sensors causing the interior lights to stay on. See "Related Questions" below for more about that.
Fuse is on right row of fuse box - 4 down from top. It is labeled "battery saver" look inside fuse box cover for labels
Of course.
If you leave the lights on the battery goes down or anything else that uses the battery over night. But if that's not it, the battery is worn out and you need to buy a new one.
It is probably a bad diode in the alternator. I just went through this with mine. I the battery runs down overnight then the battery may have a dead cell. It may also be something is on drawing power from the battery. Something like interior, under-hood, trunk, glove box lights. Can also be a stuck relay.