2017 Freightliner Cascadia - After batteries were replaced today we went to turn the ignition and all that happened was a buzzing sound coming from the passenger side of the truck. The CLDS was slowly blinking, and the PNDB was blinking. Okay, so either one of those need to be replaced now. I took a breather and came back to truck and now neither the CLDS nor the PNDB are blinking or lit up. Could there be a bigger problem that I'm looking at now?