I was fooling around with some small T5 wedge LED's and decided to see if I could replace the turn signal warning light in my headlight shell. I have a standard (pattern) 12 volt lucas set up on my '74 Roadster. I guess the LEDs are single polarity because it only worked when one side indicator was flashing, and if I reversed the connection it worked with the other side. I am an electrical idiot so my questions are: 1] would a dual polarity T5 work, if there is such a thing? 2] is there another gizmo that will fix the problem without costing an arm & a leg?