I bought several Model A horns from an estate sale and would like to check them out to see if they work before I completely dissemble them for cleaning and repairs. I have removed the covers and did a visual inspection and made sure that the armature turned freely. How can I check to see if they will turn with a battery connected to them? Can I connect the two wires to a battery to see if it works? Also, what was the color of the original wires that supplied power to the horn? Thank you for any help you can give me on this matter..