I HAVE A 65 CHEVY TRUCK,LEFT SIDE FLASHES FAST,RIGHT SIDE NORMAL,ALL SAME BULBS,COULD IT BE FLASHER?ALSO IS THIS TRUCK SUPPOSED TO RETURN TO OFF AFTER SIGNAL LIGHT LEVER IS ENGUAGED,I HAVE TO RETURN IT MANUALLY,IS THAT THE WAY THEY WERE OR IS MINE BROKEN? THANKS