2008 Suburban LT
My girl killed my battery by listening to the radio! I Jumped it charged it still no start no crank no click no lock unlock from door or remote. Stabilitrack randomly turned off. Replaced battery still the same problem. I’m thinking maybe a fuse or relay but they all look good. Im stuck& i need help asap!

 

do the cluster lights and icons come on? What does the battery gauge read?

 

I doubt that listening to the radio, even overnight, would hurt a battery. I think your issue is unrelated to that.

 

yes all of them come on Nd the battery gauge reads 13 volts.

 

I agree but when i came back to the car the battery icon was blinking & the car wouldn’t start. Checked the battery & it was no good but with a jump the car should start. Could it be the bcm?

 

It would completely drain a battery. You might get 6hrs of listening. Definitely not overnight. Deeply discharging a battery that is only meant for cranking is very bad for it. (it's not built to be discharged below about 80%). Doing that a few times will pretty much kill a cranking battery. Especially if it wasn't in great shape to begin with.

Will the vehicle start with booster cables to another vehicle?

 

I left headlights on for 3 full hours on March 16, 1985, and my car started right up. Of course that was a 1970 Volkswagen !!! Headlights use way more amps than a stereo.

Folks DRIVE old VWs a couple of hundred miles just on the battery when the generators go out on old VWs.

 

Sure. That's not surprising since a vehicle only needs 25A or so once it's running. But you need hundreds of amps to start it. More if it's freezing. Also, we are talking about a heavy Suburban with a big V8 engine. Not a little VW. It takes a lot more power to start and run.

An average stereo will use between 5 and 10 Amps. A halogen lamp that fits a 1970 Beetle, such as Sylvania H6024 draws 3.3A

A group 48 starting battery will have around 70Ah of capacity (brand new, fully charged). That means @ 7A draw, the battery will be flat after about 10h. Of course, the stereo will stop working long before that. The vehicle will also be un-startable before that. You will start to struggle with cranking below a battery volage of about 11V (esp in winter). Of course, you don't want to discharge a starting battery below 75-80% since the lead plates inside will start to disintegrate and short out.

I would give it 4 to 6 hrs of stereo time before you can't start. If his daughter was using lights, chargers, seat warmers etc or left a fan running, then it would be even less.