I bought a couple different spools of supposedly quality braided copper wire. I have wired things like auxiliary lights and the horns. I use shrink tubing over the areas I make the connections. For some reason the wire deteriorates after a few months and turns a powdery blue/white. The components stop working. Any of the original wires I cobbled on to are still good. WTF is going on? Is it just sub-par quality? The stuff looks okay on the spool. The environment is dry and hot.