Time for an alternator rebuild.
The alternator does not need to be removed right away. Get a voltmeter or buy one of those cigarette lighter pluggable USB charger with digital voltage readout. Know the normal voltage with the engine off, but key in the ON position around +12.3-12.8V. Run the engine, a normal alternator should have a higher voltage. Range can be from +12.9 to 14.4V).🤨🧐
Funny that I've done this for years when checking the alternator to see and diagnose a charging issue. 🤷🏼♂️
You only remove the negative post so what's the big deal?
Oh I'm a full class A Marine Electrician with 40 years as an electronic tech so maybe I know a little something about complex electrical systems. 🤷🏼♂️😉
1 post pony comes in here to stir the pot. 🙄🖕🏻