See video here:
http://s843.photobucket.com/albums/zz356/blatham489/LED%20Flasher%20issues/Using switchback bulbs in front, led tails, electronic signal and flasher units (identical to each other) from Chev's of the 40's. Notice as voltage load increases (turn on parking lights, then headlights), front bulbs work less and less. With lights on, front signals don't flash at all. With nothing on, hazards flash but very dimly, add more lights and they don't work again.
Granted, the engine was not on and it's possible the battery is a tad low, but I started it up just a few days ago and it cranked right up with no hesitation so I think the battery has plenty of juice, especially considering LED's take very little current.
Anyone have any suggestions? Is this something unique to switchbacks? Do I need a special type of electronic flasher unit?
TIA
