Inliners International Forums General Discussion Electrical 6 volt horn

I've got a set of real nice early 6 volt horns that I would like to use in one of my trucks.I tested them with my truck's 12 volt battery and they are working great.Once I install them would it be ok to feed them 12 volts or should I come up with a way to supply 6 volts?If 6 volts are needed,how do I go about reducing voltage from 12 to 6 to feed the horns?HF