Not cranking over but will with relay but now no spark

Looking in a wire diagram and trien to trace wires not seeing anything bad along the way..also wierd thing that happened first time I started and it stalled after fixing the wires the horn went off and stayed on (but sounded weak ) until I removed battery terminal..but didn't do it again after it did it once??
Also started after I did. The ground s. And chked few things and it's charging at 16 + v at idel