white lightning

hi all, after 9 weeks flat out in me garage ive finally got my car back into one peice(after buying it in boxes).but get this ive got to the point where i can get it running and ticking over fine,but when its running if i press the front windscreen squirtys it kills the fuel pump.also with ignition on (engine not running)if i tap the squirtys the fuel pump comes on with the taps,have i made a common balls up some where along the line?????.
its possesed init.ive been trying to sort it out today(really wish i haddent).on futher investigation its not killing the fuel off completeley but is priming the pump again each time i press the front window squirty button also when i turn lights on and off..please and wizzards on electrics out there??? thanks