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I seem to remember that the LM339 has an open collector output, so the folowing CMOS willned a pull-up resistor on its input. Hope this helps

Some power supplies "fold back". They deliver say 15 amps but if more than this is drawn, say a short circuit,then they reduce the current to a much lower level.

we used to use a compound which set in a few seconds when exposed to ultra violet light. worked very well.

If you are going to power the unit from the horn button, then you might like to consider modulating the current you draw and sensing the current change at the horn, or its relay