Ignition wiring issues

[71DreamMachine]

For days it was charging while running. Once it sat it drained the battery. Just recently it started smoking in the cab and then it puttered off idle and drained completely and wouldn't start even after the battery got enough charge. Once it sits for a day I try to charge the battery and start it. It will get started and idle and this last time smoked up the whole inside can. There's a wire underneath that was added on to the red wire (I think the aftermarket stereo) and it burned all the coating off of it. Also, before I changed the voltage regulator the headlight ( left) went out and would only work on highbream. The headlight came on once I replaced the regulator. However, when I burned that wire and smoked out the cab it went out again. Now what are your thoughts? This is frustrating me.
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