I am new to the site, and am happy to be here. Here is my problem (its a doosie). This is a little long winded, so please bear with me. I bought a 2005 Sport Trac Adrenalin in September 2017. I drove it daily for the first 30 days to see if there were any bugs to address. For the most part, everything was OK. Then the problems started. Since this is an extra vehicle, it sits in the street for days at a time. I would go out and have to jump start the truck after as little as 48 hours. I was told to get a new battery since the one in there was from Walmart. So, I went and bought an Interstate battery and had the same issue. Being an Electronics Technician and understanding such things, I attempted to find the source of the drain myself. I even completely unplugged the aftermarket stereo since that was the most obvious culprit. This was all unsuccessful and frustrating. I then took the truck to an Auto Electric place that was highly recommended. They told me they couldn't find an abnormal drain but found the driver door latch assembly was broken and could be randomly waking up the truck. $250 later, I drove it home only to have a dead battery a week later. I took it back to the Auto Electric place and they kept it for a week and found no abnormal drain, but did say the battery was suspect. Since I had just bought the battery 6 months prior, I took it back for a new one under warranty. Two days later, I had to jump start the truck again. The next day, it was dead again. This time I took it to the Ford Dealership. They told me that the alternator was not charging properly. $650 later, I picked it up. I had to go out of town, and after letting it sit for 4 days, my wife checked it and the battery read 8.5 volts. She had it towed back to the Ford Dealer to check it out again. They kept it for a week and found no abnormal drain. Here is where things get a little crazy. The technician at Ford told me that he has seen security cameras interfere with vehicle PCM and wake up the vehicle. My neighbor has a NEST camera pointing out the front of his house, so the tech told me to try parking it out of range and see what happens. I skeptically agreed and took the truck home. I am now waiting to see what happens. I did some research online and it appears that EMI from things like cell phones, garage door openers, etc can effect PCMs. What I can't seem to find is if there is any way to prevent it. Do I need a new PCM? Can I shield it and still use the keyless entry? To summarize, battery is dead in as little as 48 hours. New Battery, New Alternator, New Driver Door Latch Assembly. Any time the vehicle is not at my house, there is no battery drain. Crazy Technician thinks neighbor's Nest Camera is the reason. If you read this all the way through, thank you for your time.