So son was coming home last night in his truck (2012 Silverado 1500) and he said the lights all went dim and truck almost shut off.
Managed to get home but then truck wouldn’t turn over?
Went out just now and truck started and I moved it down to the shop.

I’m thinking of replacing the battery because this one is a few years old anyway. Hoping that corrects the issue, but I am no kind of mechanic

The times I've been driving and the radio goes, the lights dim and the vehicle dies, it's been the alternator.

alternator. you can get it tested at autozone. battery too.

Batteries go bad in 36 months on average. But it sounds like the alternator here, like Bob said, go see the guys at Autozone to make sure.

If the light dim and radio quits it is the alternator.

Not sure if it works in newer vehicles but I know in my old 86 pickup you could start the truck, unhook the battery and if the truck died then the alternator was bad, if it stayed running the battery was the problem.

cant do that these days. you'll fry your computer.

Alternator for sure. The battery is pretty much just for starting the vehicle. If the alternator goes out then the battery becomes the power source. Which will drain it

Sounds like an alternator issue. I’d replace both.

Quick and simple check with a volt meter. Measure the voltage between the battery terminals with the engine off. It should read 12 volts or a touch more. Start the engine and measure the voltage. With the engine running it should read around 14 volts.

Yeah that's what I figured.

This is spot on and how the auto parts store will check his truck more than likely.

I just replaced the OEM battery on my 2014 F150 a week or so ago.

They don't last forever.

Alternator. Try to find an auto electric shop to repair it.