One thing I failed to add in the Original How-To. FWIW, this doesn't affect anything adversely, just another thing to add if you want.

You can put another diode on the same wire as the resistors, between the bulb and the resistor. This will allow the sidemarker to be a tad brighter when the turn signal is on. Some may notice a difference and some may not.

Entirely up to you.

John
jcaimhigher@ixpres.com