Faulty battery, bad alternator, or both (photos)

The J3 is what is known as "IGN2" or the "ballast resistor bypass." It only goes one place "functionally".......from the switch, through the bulkhead, and to the ballast resistor terminal which connects to the coil+ terminal

The brown to the interlock is a branch but it's not in series. If you have not bypassed the two yellows in the interlock relay under the hook I would do so. Then, you can simply unplug the box under the dash

So far as the key buzzer I'd love to leave it disconnected / unplugged