Let's see if I can help. I have a similar model and it is a limited. My battery would drain to the point over about 3-5 days there wasn't enough charge to turn over. I had to replace my battery about 4 times over a five year period. I will keep this short as possible. I took me some time to determine the problem. First, how quickly does the battery drain? If it drains overnight, it is most likely alternator diodes. Even if your charging light does not come one, if there are up to 3 diodes, the alternator can still charge. If you have an inductive digital test meter, you put the clamp around the battery cable to see any parasitic draw while the engine and all accessories are off - in other words, doors closed and key out of ignition. Wait up to 45 minutes before checking to ensure al systems have shut down. The other way is to put your hand on the alternator after the engine is cold and if the alternator is warmer than the engine, the diodes are probably shorting. The hardest thing you will need to do next if the alternator checks out is do a fuse by fuse removal. My problem ended up being the smart junction box SBJ(under the driver's side dash. It is also a fuse box). Mine is either one of two fuses and I haven't determined which yet. The number 2 and/or 3 are intermittently drawing. When I removed them it solved the problem. The SJB has other relays etc that cannot be replaced, the entire SBJ requires replacing. Good luck, took me hours.