ctferguson71

I have a 2018 GMC 2500hd Sierra, 6.0 liter and i installed a power harness to the truck battery for my fisher plow. After installing the power harness, it was to short and started to remove the harness for a longer fisher plow power harness. When i was taking the leads off the truck battery, my wrench slipped off the negative side of the battery and hit the positive side and a good arc happened. I didn't think to much about it but later that evening, i went to lock the truck with the remote and the horn does not peep when you try to lock the truck. Also and more importantly, when i put the keys into the ignition, my dash lights will not even come on, the truck will not start. The truck lights come on fully when i unlock the truck with the remote but have no power to the dash. The radio will not even turn on. I tested the battery and i get 12.75 volts so the battery is good. Can you blow a fuse by arcing the battery? I've read other posts that say to look at the PCM, what is the PCM? Does anyone have any idea on what is the culprit?