Van has power to alternator & battery, but no power to van at all

I recently replaced an (oem) alternator with the belt and started having weird metal snap noise in front left side in slow driving after braking before stopping the vehicle. Also, I started having cricket noise while slow driving or not driving along with irregular engine speed noise. All these noises usual start after driving awhile. I went to the multiple repair shops and replaced unnecessary (left axle front axle assembly, Sway bar link, Valve Assembly, Valve Assembly Vacuum) but the issues still haven't been resolved. Also, I recently replaced (oem) front rotors, calipers, brake pads. All my issues have started after replacing the alternator. Any idea? Thank you.

Battery draining. Tested alternator and it's good. Tested all the fuses and relays with multimeter and none of them stop the drain.

The "R" was flashing and clicking from the dash at the same time. Found video that diagnosed as potential starter relay failure with testing as resolution. Auto Parts helps with a dianostic tool that says alternator is failing. I would like to test the relay using the horn relay detailed in the videos,but they appear to be different, more like a fuse. This is under the hood. I'll look again at the diagram. Maybe the relays are under dash.

I had my alternator replaced at my local car shop, and now the factory remote start and alarm no longer work.

Did the alternator and had to takeoff one of the radiator hoes to get to the alternator. Cooler came out, topped it back off with coolant and try to bleed the system, but I noticed the bleed screw is a little bit loose. Not sure if that’s my problem.