I've seen this question, but no definitive answer. I have a dash cam that needs both switched and constant power. The switched is easy. Is there an always-on fuse in the footwell fuse box. Is there a wire I can tap into without running a wire from the battery? I'm open to suggestions.

Thanks!

 

Grab a volt meter/test light and start poking around. THe ignition switch and radio will have an always hot wire.

 

I am not a car mechanic but just hate to sit and wait for someone else to help me out, so I do my own experiment with things... therefore use my advice on your own responsibility.
I have a 2006 Honda Jazz and I found that fuse number 20 has constant power regardless of the state of the engine.
I wanted to install a dashcam into my car so it does not take my cigarette lighter socket plus it can record everything even when I am in the parking lot. Since apparently No# 20 is not used for anything anyways, it will not interfere with other important electronic parts if I play with it, and it is safe to use. I plugged an "add a circuit fuse tap" adapter into the fuse slot and a switch that I can turn the power of the camera on and off whenever I want to.
So far so good, everything works perfectly fine. I was running my Vantrue Pro 2 with the screen on the entire night and morning and the battery did not even feel anything. I am not sure if the circuit that came with the camera has safety turn off protection in case of low voltage but if it can be on for a whole day without any problems, I am not worried.