Question about 1984 Honda VT 500 C Shadow

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There is an occasional no power when key switched on. to a hotspot the immediate left of the horn. developed at a point in that panel. The wires in How should I proceed?

I have a wiring problem on a 1984 Honda Shadow 500vt There is an occasional open circuit the power side, no power when key switched on. I have traced the problem to the wire distribution panel to the immediate left of the horn. When the circuit does come on waggling wiring all runs normally, except that after a few minutes, a hotspot developed at a point in that panel. The plug assembly connecting a couple of wires shows signs of overheat. The wires in question are one row inside the panel. I cannot tell, from the wiring diagram where that connection is. How should I proceed? What does this panel do? Why are the wires connected here? Given that it is designed to be in the slipstream, is warming up normal?

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