just want to head up with some low voltage transformer do have split ciruit type so one set of screw it will read 12 volt and other set of screw is 12 but get one other set can nail on 24 volts just like 120/240 volts system is.
the other thing i need to verify is the bulb #'s IE #194 is common 12 volt bulb or #1156 is one other common one.
http://www.homedepot.ca/wcsstore/Hom...a66c691f_4.jpg
this one type of low voltage transfomer and there are few diffrent style there.
you should see the voltage rating on the transformer on secondary voltage it should be very clear marked there.
Merci, Marc