"I have a mint '78 Puch Newport. Tail light is burnt out. Brake light is fine. Want to replace both (since it is 20 years old). The bulbs are 10W for the brake light, 5W for the tail light. I saw on the web that they are available in 6 volt or 12 volt. Most (if not all) bulbs are 12 now-a-days. I am figuring it is a 6 volt system. Anyone know for sure? What happens if I put the wrong voltage bulb in? I have the two 6 volt bulbs on order now. "