We own a 2016 GMC Denali Duramax. The other day my Boyfriend went to unlock the truck from the remote an it was like it was possessed. The door locks went up and down, Head lights flicked on and off, Horn blew the only way to stop it was to disconnect the battery. We took it to the dealers and they could not figure it out and gave us back the truck. We drove 1 block and the warning lights came on. We just bought two new batteries for the truck.... any suggestions?
What warning lights? Go to an auto parts store like O'Reilly and ask them to scan your truck for codes. Record the codes in the same order they are displayed on the code reader.
Remove and clean all of your battery cables, both ends, and also the alternator cable. Make them shiney clean with a wire brush or sand paper. Use a little dielectric grease on the connection when you reassemble. see if problem goes away or changes.
Start here: https://www.gmupfitter.com/pages/body-builder-manuals
Then look for your year and model, and then look for the electrical manual. Not every year has an electrical manual that has all the grounds, so go a year earlier or later and you'll know more about Silverado grounds than almost all of mankind on earth
2008 Silverado LT, CCLB, Edge Insight CTS
2009 Arctic Fox 29-5T, Silver Fox Edition, Onan 3600 LPG generator