Recently the wife's car (2013 Ford Escape) died just a few hours after being off. The battery had been changed fairly recently (2 years prior), so I put it on a charge overnight and noticed when I came out the next morning it was still drawing 5ish amps off the charger which was unexpected after have sitting on the charge for 12+ hours. Pulled the charger off and ran a meter across the terminals and got upper end of 12v. She was able to start it and drive that day, but after just a few hours of it sitting again it died on her leaving it unable to start.
At this point went ahead and got a new battery, installed it and reset the BMS. Same thing started up only a couple times then after a few+ hours of being off it died. So, I started scouring the web for the most common drain issues hoping to save myself some time and I checked the most common things I ran across (Rear wiper motor, glove box light, instrument cluster, brake lights, and all interior lights), but still no luck on any of those, they all seemed to be fine.
Next thing I did was get access to all the fuse boxes (engine, passenger, and trunk), and then let the car sit for a while to fully shut down its systems (30+min I waited). Hooked up an ammeter and had a 5 amp draw while it was off, started pulling fuses one by one to see if I could isolate the circuit causing the draw. No fuse i pulled seemed to show any change, and it maintained a 4-5 amp draw the entire time.
Then I opened up the high current fuse box (fwd of the battery box) and started playing with those to figure out where it was coming from. I was able to get it isolated down to MEGA 4 50 Body Control Module (see below) wire, with this disconnected i was under 1 amp draw. This sent me back to the BCM, but this time I fully disconnected the BCM hoping this would be the be the right area and the current would drop down, but it remained at 4-5 Amps with the BCM electrically disconnected.
I haven't found a wire diagram for MEGA 4 yet that would help me call the wiring good or bad, so I am out of ideas at the moment. Hoping someone has some good direction for me to go since there's not a lot of resolution on some of the similar posts. If you need clarification on anything or something I said doesn't make sense let me know and ill be glad to clarify.