^ I understand it can get complex, but you can implement tools that essentially do this for you. Adjustable pulse width modulators are perfect for this. Takes out a ton of the resistors and much less soldering. Get your max milliamps and forward wattage figured out, and leave the "dimming" to the strobe effect of the pulse width modulator. Set the duty cycle of the PWM for how dim you want them to be during turns and you're in business. Much easier to just buy a premade microcontroller than it would be to actually assemble and solder an entire board. It gets even easier when you use 'snap' LED's and some custom acid washed printer circuit boards. Design your circuit, snap in the LED's in the proper series, and hook it all up to the controller.
You can even keep the stock "back and fourth" turn function where the front signal flashes and alternates with the one on the side of the header panel. Just put a few blocking diodes in the power feeds so the current can't backtrack.
If this were just a few LED's it'd be a snap. But with dozens of them like in this project, you're right, it can get really confusing trying to regulate and feed them all. Most PWM's can handle around 1.5 amps max, which is where you have to do some calculating. If all the LEDs in the array pull less than that at the design current then you can use it without further regulation/modification.
This thread has been deceased for a while, I'm gonna have to go back to the beginning and re-read it to get up to speed again.
Edit: Alright just re-read the whole thread. I see the boards were indeed custom printed, but with those LED"s all whacked out the way they are they seem to just be wired in wrong on the boards. Poor planning or printing? I have no idea. I'll get with some buddies and put together a schematic, and hopefully I can find the time to slap together a demo board. Won't be inside your slick vacuum formed housing, but I'll make sure to get the same amount of diodes and the same functions you're trying to achieve. This is a very possible project....
