2018 Silverado Battery Change now having issues

9999usmc · September 29, 2021

Dealer troubleshooted said one of the fuse box wires on the tray that sits on top of the battery wasn’t connected. I didn’t see any wires not connected when I check, but it’s working now and all is good.

CrawlSlow · September 29, 2021

My guess is, it's probably post #1. That one has two cable connected to it. If you don't look carefully, you'll missed the second cable for sure, everything will look correct with just one cable until you starts poking around.

Edited September 29, 2021 by CrawlSlow

jetcity2000 · October 27, 2021

On 9/18/2021 at 7:28 AM, 9999usmc said:

Yeah, checked. Called dealer yesterday and asked if they have ever heard of something like this and got a quick, you can bring it in and we will run a diagnostic check….

saw a post on here who had same problem but he hasn’t replied if he got his issue fixed

make sure you plug the light blue plug in below the pos post

VERSE13 · September 29, 2022

Awesome post, had the same issues after a battery change, help me out a lot. After searching I found this wire tucked away. Sure he forgot about it.

Edited September 29, 2022 by VERSE13

Topkicker · February 19, 2023

Thanks to everyone who contributed to this post with solid information and picture. I moved this 2nd cable way out the way while removing battery and overlooked it when going back together. Saved me a trip to the dealer! Just wanted to say THANKS!

Sney · October 5

On 9/18/2021 at 8:04 AM, 9999usmc said:

My 2018 Chevy Silverado was fine until after AAA replaced my battery as it had a bad cell and wouldn’t keep a charge. I watched them replace it and they did every correct (negative side first, etc).

Now my windows won't roll up or down,..ac stopped working, my radio screen is dark, only the left side turn signal works, no power door lock, no steering wheel controls…..

I checked all the fuses and nothing looks blown, I disconnected both terminals for a few hours and reconnected thinking something would reset, but no joy….

Any suggestions?

My 2018 1500 just did a similar thing. Battery is draining somehow and when i Jump it the passenger windows wont roll down, stereo wont work, ac wont work and only the left front blinker works, no brake lights. battery and alternator tested good. Please help?!?!?!