Okay boys, what did he do wrong?
So on this GMC K2500HD I bought the owner had a LED back up light installed, they used those things you put on the wires and then squeeze shut with pliers and it saves you time as it is quick, anyway...
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Those wire taps tend to break about half the stranding on the wire into which they tap. I spent a while removing all the one the previous owner of my vehicle used. The wire stranding on every wire near a tap was broken and severely corroded. I had not had issues at that time, but it was just a matter of time.
