Had a wiring problem

I installed a LED bar around Christmas time, its been on and working great for some time. Today i smelled some weird electrical smell while driving and figured that couldnt be good. I did some investigating in my console and found this



This is the wire that melted the loom in the pic above. Looks like maybe a diode or whatever got too hot or shorted out.



Now, i know first thing everyone will think is how did you wire your light. I used the drawing i found on here below;



and this one



What exactly would have caused this? Could the diode just go out on me? The switch wont work obviously so im hoping i didnt blow the OEM AUX switch. I know the OEM wiring in the harness is very very tiny, could it just have maxed out the little wiring?

Can i just rewire it with bigger wiring without a diode or whatever is in that wire which melted?

Anyone have any idea?

 

my first thought is to checl all your grounds for connection or possibly too much corrosion

 

The diode is in the oem wiring. I did a ton of googling last night and its apparently there for oem wiring. As if I was plugging in to factory system. It's so the computer won't overload the switch. But a lot of people instruct to remove the wire with the little diode in it and wire a normal wire and have no issues. Its been hooked up for a month no issue then I was driving with it off and smelled plastic.

Its the red/green wire so its the wire in which leads to the relay.

 

Ok, i figured it out.

First tested all connections, all were good and getting power correctly. I tested the relay and it showed i was getting power at the relay but not to the light bar. I then tested the power wire to the battery and the light worked somewhat so i then looked at the ground. I unhooked where i grounded it and then touched both terminals to the +/- and the bar was fine, lit up like normal.

From there i made a different ground and tested it all and it worked great. So i patched everything back up, set it all up and works great.

My guess is the ground shorted out the diode and the diode burned up protecting the switch. Just glad i figured it out, was beginning to frustrate me.