No defects in crack or charging

[Accomis]

The title indicates that my E93 experiences a no-charge or no-crank issue, yet it may be jump-started. I conducted research on this topic and found minimal information. I have purchased a new battery, although there is still no ignition without a jump start. Attempted to install an alternative power distribution box and conducted continuity testing on what I believe to be the best option. All cabin lights and controls appear to function as indicated. I have directly checked the alternator, connecting the red wire to the red cable from the alternator and grounding the black wire. However, this method yields no voltage. Any assistance would be greatly appreciated. Thank you very much

[PopeyeR]

The primary electrical conduit from the battery to the engine compartment appears to have malfunctioned; remove the battery and inspect the connection points. I would speculate that it has decayed.

[Accomis]

All wires originating from the battery and power distribution box appear to be clean and free of corrosion; however, there was a quantity of stagnant water in the battery tray, which has already been removed.

[PopeyeR]

What is the status of the transfer points? They are located in the battery compartment and are only visible when the battery is removed. If water has been present in the box, it is quite probable that they have decayed.

[Accomis]

I will need to investigate tomorrow morning. Thank you. Do you have any insights into the zero voltage from the alternator and the method I employed for testing it?

[PopeyeR]

If there is no power or connection to the battery owing to corroded connections in the battery box, there will also be no output at the alternator terminal.

[Ziinsig]

I become rather anxious in the absence of crack; you will be OK.

[Mututing]

It can only be attributed to a poor connection.
When you jump-start it, are you utilising the jump point located under the hood?
Inspect the ground connection as well as the one on the engine.