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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!
I have a 2003 mercury mountaineer with a dying battery problem and we narrowed it to fuse 1 and 29 and they are labeled PJB in the owners manual....if you find out what that means I would like to know too. I don't know if that will help you any
A 50 AMP fuse is a main power fuse. This is not "isolated" that thing probably feeds 5 or more other circuits. You need to get the power distribution diagrams and narrow it down further by pulling the fuses (NOT RELAYS) that are fed by that fuse. Once you have it narrowed down to a single (small) fuse, then you narrow it further by checking the circuits that are fed by that fuse. You must check everything that is fed by the small fuse. The easiest way is using the power distribution diagrams to unplug all of the components (one at a time) that are powered by that fuse. Sometimes you can eliminate two or three components at a time by disconnecting a single, common connector.
Do you have the tow package on your vehicle? If you do it sounds like your trailer electric brake controller is shorted out (normally mounted under the dash on drivers side). There should be a fuse that controls your tow package either in the fuse panel or as an in-line fuse.
If that isn't it, then I would suggest a clamp on amp meter to help you narrow down what is draining your battery. BUT have you had your battery tested to make sure it is good?
So with the key, lights, and everything else off, there should be no drain on the battery. Take off one terminal and put a 12 volt test light between cable and battery post. It is lights up, you have something on all the time. Most common are interior, trunk, and engine compartment lights. Cigarette lighters can short. Alternators can blow a diode and drain. Fuse block can even short internally.
Trick is to narrow it down. Pull fuses one at a time, to see if any help. Then start disconnecting branches. Alternator for example. Alarm systems of custom stereo stuff is often wired wrong or a drain. Anything with a remote, such as an iPod or keyless entry can even do it.
Have you tried to pull one fuse at a time to see if you can find it that way. From your post I am going to assume that your are using a test light or meter between the battery term and disconected cable. If not try that as you pull the fuses and narrow down the draw. Don't forget to pull the light bulb from under the hood and make sure that the dome light and all other asscessories are turned off.
My girlfriend has an eddie bauer as well. We had an issue where the blower motor for the heater comes on unexpectedly when the key is out and it's parked. And kills the battery ... in about 3 hours ... We pulled the 30A blower motor fuse under the hood ... I think it was called the ECC fuse Electronic Climate Control ... Go put that fuse back in ... sit in the car the blower for your heat may come on ... Maybe ... ours happened onlt 2x in 6 months, then it has been fine ... there are two possible solutions replace the ECC motor control (under the hood and fairly difficult to get to), or it could be the less likely Dash heat contol panel ... both are costly