Have a 2014 yamaha grizzly 350 4×4, installed spray tank to atv and while placing seat back on pressed alligator clip on positive battery terminal against frame causing spark. After this atv has failed to start, have no spark at plug. Did load test on battery(good), inspected all grounds, all wires for any short. Replaced ignition coil and spark plug cap/plug. At a loss any ideas/help appreciated