Interesting Charging System Issue

[Spy_vs_spy]

Thinking of getting and ultra gauge to be able to diagnose and manage the situation, it sounds like the traditional wired unit gave you more feedback than a Bluetooth one would.
Also I could put a charger in the engine compartment, just to make it really easy to get a top notch charge on the battery, power outlet is right in front of its parking space.
Obviously willing to put a fix in place too if either voltage regulator or alternator diodes are the know fix. since we don't drive it much or on long trips I have time to get the right fix planned out.