Bought a HS years ago. It has a Happ power supply mounted on the inside top of the head. I thought is was factory at first. The siren and light work fine but sometimes in attract mode the siren clicks, or maybe it's the relay? When dropping a coin in, the siren spins and doesn't click. Weird. I realized later on that the power supply is a hack because it was fitted with a 12V siren. I bought a spare siren with a motor from a fellow Pinsider a while back for a spare.
This past summer I bought another HS with the original siren setup and it has 4 wires going to the lamp socket, 2 solid white on one side and white with blue hash marks for the other. The spare that I bought only has 2 wire for the lamp and 2 for the motor. See pics. I can't understand why the one has the extra wire to the lamp socket. Also what is the correct lamp for the siren? 12V or 24V? I plan to remove the 12V siren and replace with the original spare. The red wires were cut and the fuse was bypassed so I have some work to do. Have to buy a new 3 position connector as well.