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wow- 6 pages of comments on this topic. I had it come up for me as possibly 2 separate issues- lights on when camping and battery draining. I put switches in parallel with the "door open" signal so the BCM wouldn't know the door was open if the switch was on. Ford does weird stuff- the door lock mechanism REMOVES a ground when the door is open. Therefore the switch keeps a ground applied. Problem is that the sliding door isn't grounded, so I had to add a ground wire to the slider. (I only did 3 of the 5 doors- driver / one sliding / rear). The wire that needs the ground maintained when the door is open is one of the 3 smaller gage wires. I used a fine pin to pierce the wires and used an ohm meter to look for the one that gained/lost a ground when the door is opened/closed. As far as the battery draining- I had that happen because I removed the stock radio. The 4.1" display works in conjunction with the radio. Remove the radio and the 4.1" display seems to always be drawing enough current to stay fairly warm. I noted what I did about that in the post I just did about the radio- "2016 Transit Connect Radio / 4.1" display project"

I had a hell of a time figuring out a way to properly angle the new radio. Since I don't drive it for several days in a row, I found the 4.1" display was draining my battery. My new radio had a backup camera so I didn't need the 4.1" display. I laid it inside the cavity, but always found it was warm to the touch even if the van hadn't been on for some time. That meant it was always drawing power. Problem is that it's needed to turn on the "radio +12V" signal in the wiring harness. Here's a link to the Youtube video (12 minutes) about how I fixed it. It's not for the technically challenged. https://youtu.be/H_z1N0cwIrU