Then I found you can run resistors in parallel (to add) and sequential (to subtract). I ended up getting 2 resistors that were 1/2 the size listed and running them in parallel.
Also, since the lights in the how-to are half powered when the headlights are on, and I'm using LED's, will they work OK? I'd think so since they're working off 12VDC.
Since no one answered my question, I'll do it. I hooked everything up yesterday and the LED wouldn't blink, it just stayed lit. I put a regular 12VDC 194 base bulb in, and it worked. The LED bulb I used was from SuperBrightLED's and had a 12 VDC 194 base that worked with straight power to it. I guess the diode and resistors changed something electrically. I'm disappointed but at least I have new side markers now.
LEDs don't work the same way, i.e. you don't get less light on lower voltage, it's usually either on or off. :shrug:
You could try two LEDs - one on all the time, one that blinked on and off?
I just like the way the LED's respond and the way they look. If it wouldn't be too much to ask, I'd be curious to know how he did his, as long as they act the same as the bulbs in the how-to. I can always use the signal wire as a hot source, but I'd rather have the half bright and the full bright signal.
Also, since the lights in the how-to are half powered when the headlights are on, and I'm using LED's, will they work OK? I'd think so since they're working off 12VDC.