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seems a silly answer but give it a try; check your trunk light switch... if it fails your trunk lights will either stay off or stay continuously on resulting a battery drain
The door ajar light doens't have a separate fuse. But you can probably fix the problem in 15 minutes:
Make sure all doors and trunk close tightly. Lean hard against each door, starting with the driver's, because it is the most likely since it gets the most use. Watch the light. If it goes out, you're halfway there - you've located the problem door.
Squirt some WD-40 into each door's switch. They may be located near the hinge, or near the latch. Press the button repeatedly and then wipe it off. That may fix the problem.
Next, it could be the alignment of the door and strike plate on the jamb. Adjust the latter until the light goes out.
If that doesn't do it:
Dont worry about the battery going dead from the indicator light staying on - it draws too little current. But if a dome light (or trunk light) stays on, it will drain the battery in a number of hours.
You didn't say whether the dome light stayed on. If so, or if you have any other information, please post it and I'll try to help you determine the next steps.
The cheap switch that controls the trunk is not working properly and the light is staying on (to drain the battery and trigger the warning) fix the switch. All you have to do is find the switch. Probably is not correctly positioned.
Old age usually. A draw on the battery that should not be there will drain it. If your dome light ,hood light, radiio, trunk light is staying on drawing amps without your knowledge it will drain the battery. If your alternator is not putting voltage back to the battery it will stay drained. (Bad Alternator) Your local autozone will check it for you for free.
something is draining the battery while the engine is off. best thing you can do is look inside the car from standing outside (do not open the car door, this will turn on the dome lights, you want it dark inside) and see if you can see any lights on, look around the visors, glove box, console. sometime the visor light will stay on and because the visor is always up you'll never see it during the day. have someone get into the trunk and close it to see if the light goes off. (you realy need to trust this person)
crawl under the engine and look up to see if the engine light on the hood stays on.
best to do all this at night or inside a garage that is dark.
If this done't work a professional techincian will need to perform a parasitic test on the electrical system to look for a drain.
I would have to guess that the trunk light is on all the time and that is what is draining your battery. On the other hand it could have nothing to do with the trunk and you could just have a bad battery. I'd say take it to a body shop to get the trunk fixed, also have an auto parts store check your battery.
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