HI. WHEN I HIT THE SWITCH FOR THE REAR TAIL GATE GLASS DID NOT WORK. CHANGED RELAY AND IT WORKED. BUT I USED A HORN RELAY NOT A WINDOW RELAY. THE NEXT DAY I CAME OUT TO START THE CAR AND BATTERY WAS COMPLEATY DEAD. NOW WHAT I WANT TO KNOW IS, CAN I USE A HORN RELAY OR ARE THE HORN AND WINDOW RELAYS RATED DIFFERENT, OR IS IT SOMETHING ELSE, THERE ARE HORN RELAYS AND WINDOW RELAYS SO THEY MUST B DIFFERENT BUT CANT FIND THE ANSWER. THANKS FOR ANY HELP. GLENN