I'm starting to wonder why it's so difficult to come up with an LED taillight bulb that's a drop-in equivalent to the incandescent versions.
I found a 3157 style LED that's actually a little brighter than the incandescent equivalent, and it even has full beam coverage like a regular bulb, fully illuminating the reflector housing like it should. It actually outperformed the incandescent version in terms of visibility and visual crispness. It was really impressive.
However I discovered that the second "filament" connection doesn't work right, and it messes up the logic in the flasher controller. This is not the load resistor issue - it doesn't even work properly when I connect it directly to a 12v battery.
I don't get this. We now have lighting-class LEDs for home use that are far more complex than tail light bulbs and they work well. Why can't we get a decent LED tail light bulb?