So I'm driving and my battery light, ebrake light, and open door warning lights come on flickering, but the car is running perfect though, what can cause this after I replaced the alternator, motor mounts, battery terminals, new battery like at this point I'm confused 😕. I need some input plz before I run this car into a wall.

 

Speculation leads to throwing parts at a problem hoping you guess correctly; in most cases, including yours, this is not a cost effective approach. I would strongly suggest you take the car in and get the codes read and have it professionally diagnosed.

 

One of the areas of concern with that work is something loose or a bad ground. Go back over your bolts, re-tighten, and make sure the engine-to-chassis ground is in good shape. I added a ground that connected from the factory chassis ground (under the air box) to the engine block/transmission housing. There are some unused threaded holes there for an M6-M8 bolt.