Wiring Android Head Unit to Coach Batteries

To utilize the Android head unit without starting the engine or depleting the chassis battery (when used with the ignition set to ACC), I rewired the Android head unit to operate off the coach batteries. It's a great way to enjoy streaming media like YouTube, Netflix, Spotify, etc. when parked or relaxing at the campground using the upgraded Android head unit's larger screen. It's also an excellent way to get the navigation started to our destination before starting the engine. A dash switch is installed to toggle the power of the head unit between ignition only and always on. A simple wiring modification and the addition of an automotive relay are all that is required. This is how I did it.

Installing Dash Accessory Fuse Block Powered by Coach Battery

 

I generally draw power from the battery disconnect relay post, but this is inconvenient because it necessitates removing the driver seat every time I need to power something. Installing a fuse block powered by coach batteries under the dash is the simplest approach to future-proof any aftermarket additions.

Finding a suitable placement for the fuse block is not as simple as you might assume; there is barely enough space beneath the dash to put a good-sized fuse block. You could place one over the dash plastic trims, but that would look unprofessional.