First off, did it just start or was it like that and you just noticed it?

I wonder if that wingnut on the replaced battery terminal is touching something metal when the ECM mount is put back on top of the battery. It sits very high. The battery terminal looks like it’ can be put onto the back post lower than it is now.

Did you recently have your car jump started, or did you jump start someone else?

Also, that terminal end isn’t the original, so there was a previous issue that caused them to replace the battery terminal end of the cable. It should be 2 red wires going into one terminal.

Is the cable current getting hot?

See the condition of the negative cable/terminal (black line thing) and the stud sticking up between the 2? Chevy often has over 10 grounds in the engine compartment alone, combine that with a bad positive cable/connection (red line) and what appears to be a missing ground and poor negative battery contact, it would explain your issue.

Also explains any loss of power, dead or weak battery, check engine lights, codes populating, excess fuel consumption, damage to electrical/fuses and starter malfunction.

Make sure all contacts are secure and free of corrosion and damage. Use original manufacturer battery cables when possible, and know basic car maintenance if possible (everyone- it’s important, so your car lasts and so people don’t take advantage of uninformed drivers).

That’s the positive battery cable. And overheating is either bad starter, (taking to much amperage, not usually it) or poor connection to battery.

Probably loose connection.

Short. Have it replaced immediately. That thing is a fire hazard.

Poor connection look where it goes in the eye loop, it looks melted there too. Poor connections cause heat and that’s not factory and it’s a hack job.

tou got a direct short somewhere. need to get it looked at before you have a nice bonfire