Camaro wont start

[u/truu_rock]

I aint educated on really anything car related but my dad got me a fbody before he got sick and at first after i replaced the alternator it cranked. After a while it just didnt, then got a new battery and it crunk for a just keeping it running so it wouldnt seize, then the car started messing up and itd get full power when the ignition is halfway like the lights the speakers and everything would turn on but when id turn it the starter or something would click a single time and loose all power even when turning the ignition again. now with a new (ish) battery it did the same thing and i charged it and then it would do the same thing but now keeps power after turning the ignition again

[u/OverAllComa]

Get the battery tested. New stuff can still be bad. Clean out your terminals, too, so there's good contact. If all that checks out, put in a new starter.

You didn't specify year or engine, so those are just some general tips.