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You have something draining the battery. You will need to try to isolate what is drawing the electric while it is parked. Try pulling out a few fuses every night until it stops going dead. Then you can narrow it down which circuit has the fault. Try the radio, alarm system or interior light fuses first. Write down which fuses you pull out so they can go back where they belong. Good luck!
Check and make sure no interior lights are on, the most common is the vanity lights in the visor drawing the battery down or the interior lights coming on at night from a defective switch inside one of the doors
Pull that fuse or pull tail lamp relay, that should kill the lamps till you figure out the problem? You also have left an right tail lamp fuses, underhood fuse box. I don't know if tail lamp relay is faulty? Another concern, see the bottom wire on left of tail lamp relay, that is a ground controlled by the headlamp/multifunction switch, there could be a problem with that wire circuit or the multifunction switch. At the moment, I'm hoping just faulty relay.
Well, something is on if the battery is dead. Pull the interior light fuse, and the clock fuse, disconnect the negative battery cable and put a 12 volt test light between the battery terminal and the cable...Likely it will light. Then pull fuses one at a time and observe if the light goes out. Keep disconnecting until you get the light to go out. Do not rule out the new alternator, stuff happens.
The interior map lamps are powered buy the battery saver relay ( non serviceable relay ) Which is powered by Fuse #25 ( cab fuse panel ). This is for the engine compartment and illuminated vanity lamps, as well as the map lights.
The FET ( Field-Effect Transistor ) shows the fuse #9 also on it. ( marked interior lighting ), which power the interior lamps ( door / switch ).
Could be a few things if both those fuses are OK.
1. The map / interior lamp combos are usually dual element bulbs, which means if the interior lamps ( door or dimer switch on headlamp panel ) are OK, it could still be a burn out bulb.
2. The FET is having an issue from a dead short ( blown bulb or dead short to ground ). Until the short is correct, the FET will not turn back on.
Start with checking Fuse #9 ( marked as Fuse #8 in the diagram, but that shows headlamp ), which is to the interior lamps, and drives 1 side of the FET.
it is probably in the door jamb. Look for a plunger(black) or a sliding switch. Unscrew it, take off the wiring. It should shut them off, you just wont have lights when you open that door. Try all the doors until it goes off.
Well if lights are not staying on then you have a draw of power somewhere. Easy way to find out is volt meter. You take off negative cable and put one end of meter to battery post and other to wire dont let the wire touch post or anyother metal of vehicle. Then go through your fuse box and pull fuse's one at a time until you see voltage on meter drop. Meter should should a (-)negative voltage at start and get smaller when right fuse is pulled take notes and pull all one at a time and replace back in orginal spot. If you find one that really lowers the negative voltage draw on meter good chance you found where problem is. Id start by checking all interior lights first, including glovebox.