i kinda had the same problem with my vehicle. there might be something in your vehicle that is causing your battery to drain. the first thing i would do is to check and see if the battery is good. if the battery is good. take out your alternator and take it to autozone and they will check it for free. if the alternator is good, then if you dont have one, go to autozone and buy a circuit checker. it looks like a screwdriver with a point on the end and a light bulb in it. make sure you get the one with an extra wire with a clamp on it. after that, take your negative battery cable off and put the wire with the clamp on the end of the cable and the point of the screwdriver on the terminal of the battery. when the light turns on, start pulling fuses out of the fuse boxes seperately. i'd start with the fuse box under the hood. whichever fuse you pull out, make sure the light is on or off. if the bulb is not lit, then thats whats draining your battery. so repeat that step with all the fuses until your done. after you found all the fuses that made the bulb go out, make sure you find out what that fuse or fuses supply all that power to.