6 Volt Bermuda Bell on 12 Volt Car

[DDeeD]

My electric bermuda bell on my 12 volt Model A blows a 20 amp fuse almost every time I ring it. I suspect that the bell is intended for 6 volts. How should I reduce the voltage to the bell? The bell contains a solenoid. Do I need to know how much amperage goes to the coil to determine what resistor to use to reduce the (momentary) voltage? The voltage is applied to create the ding and the spring on the solenoid creates the dong when the switch is released.