I'm not a Dynamax owner so I can't direct you to any convenient 12 v source but I've found over the years that the best way to power up a new "accessory" is to make a "home run" to the fuse panel. There are lots of "add a circuit" options that allow for a new circuit to be added in piggyback to an existing, and perhaps little used (like W/S defroster) fuse.
Tapping into a wire just running near your new device can often lead to unintended consequences. The "home run" is usually the safest bet. Not always easiest but also not impossible.
A note on tapping circuits in the fuse panel, there are often three separate types of fuse buses in them. One is connected to the Ignition when key is on, one is connected to the ACC portion of the ignition switch and is only hot when key is in ACC position and the last is direct from the battery. If your accessory is only going to be used while coach is running, tap into the ACC bus as this will assure that the accessory isn't hot when the key is off.
If tapping into the Coach fuse panel, just about any fuse can be "piggy backed" although in my panel I found a couple of vacant positions. Just added wire to empty terminal, added fuse, and "Bob's your Uncle", I had power. Even have a little red LED to tell me if that fuse is blown.
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2018 Flagstaff Micro Lite 25BDS
2023 f-150 SCREW XLT 3.5 Ecoboost (The result of a $68,000 oil change
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