Hi all. I bought an Indian Head fender tip light (12V) and a single, bobber style tail light for my cruiser. I have a large 12V battery and a small doo-dad 3 way switch. When I wire up the connections, the Indian head lamp will light, but the tail light will not (even without the switch installed). The only way to get both lamps working is to connect leads from fender lamp and leads from the tail lamp directly to the battery. Any ideas why wire in sequence won't work?