Bad ground electrical issues

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Work horse

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Joined
Mar 23, 2022
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Location
Lewistown pa
Hey everyone I'm new to these things but I'm hoping I can get some help here. I have a 1989 k1500 previous owner had a switch in the dash with power but didn't go to anything. I switched my battery to top post and thought I had left that switch disconnected so in a rush I just left them loos in the dash. They ended up touching and from what I can see it fried(burnt) the black wire coming off the headlight switch a ways back in the dash. After this happened I cannot figure out where it goes but it is affecting power when using windows headlights ac/heat but flip light bars on and no movement. I also get around 14 off the alt. Am I able to rerun a separate ground for each affected unit or where do they all meat up at I can run from there. Any and help is very greatly appreciated as I love this truck lol
 
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