Ok, here's my two-part solution to this dashcam problem.
Version One is the "lite" model which is ready now.
Version Two is the "advanced" model, but not quite ready yet.
Version One will will allow you to program your Tesla Homelink system to automatically turn on your dashcam when you leave your home/garage ("Away" mode), and turn it off when you return ("Home" mode).
See more about Version Two at the end of this post.
See the image below for Version One. V1 only has 12v power in (from the car power and/or existing battery), and 12v (switched) power out to the dashcam and/or in-car hotspot.
In the image below, there are:
- One 12v input
- One remote control switch (black box)
- One extra 12v output (unswitched)
- Two switched 12v outputs (with option for a third)
- Two remote controls, Homelink compatible (only one shown)
- Two One-to-Three EL cable splitters
- Four EL cable connectors (1 input, 3 output)