Lights dim, no start, new starter, whaa?

So for as long as I can remember my g has been having this intermittent start problem, sometimes you turn the key and everything starts fine, sometimes you turn it a couple times and everything dims but nothing else happens.

Then sometimes the car wont start at all anymore and you hear a loud electrical buzzing from the center console by the ecu, which has been my que to replace the starter, ive done that twice. I got my old starter tested (most recent one that is) and its fine. So im at a total loss as to what may be causing my start problem.

I have also replaced the ignition switch (lil thingie on the left side opposite where the key goes) and the lock cylinder itself.

Any ideas?

battery? or corroded/loose cables?

Check all the grounds and the wires and look for a short. These are signs of a weak battery if it's trying to turn over. Of it dims and there is no noise check the wires on the starter

yeah its sound like a bad ground connection

it's the ground. my ground on the battery was loose and kept killing my battery. plus the no start/crank

my connections to the battery are tight, clean, and gold plated lol and the starter connections are proper, ground sounds like it, ill relocate my grounds and post an update later, thanks! :)