Ive been having electrical problems with my 1996 Chevy s10 Blazer. Used to have starting problems, not anymore, ended up changing the starter (3 times),alternator,battery twice....

Now I'm sure it's some sort of short, and that's what people keep telling me, but how do I fix this? "check the grounds" ... There's tons I ground wires where do I start? Anyway here's some of the things I've noticed:

Left turn signal only flashes when headlights are off, if headlights are on, blinker stays solid front and back.

Rear hatch button is unresponsive, rear hatch remains locked. Sometimes when I switch gears to drive and back to park rear hatch lock activates and releases rear hatch.

Dash headlight indicator sometimes flashes intermittently.

When left blinker is working(headlights off) the upper digital temperature display flashes on and off with it.

Phone will only sometimes charge thru the 12v outputs. Other times phone stays connected and says charging but battery just drains slowly and never charges.

Vehicle starts but sounds like it struggles a bit, maybe because the fuel pump isn't getting enough voltage?

Probably more stuff I can't think of, to me it seems like the vehicle has a power drain of some sort somewhere, I've already checked fuses of course and relays seem ok but haven't tried replacing them with new ones...

Any help and direction would be appreciated,
Thanks