Thanks for the schematic of the GM connections. I was also reading your post about how things work. I was interested in what you had to say about tail lights, directionals and running lights. In my '40 PU I'm using '32 tail lights (Drake's) and they have (2) single filament recepticles in them. Using my '82 Buick Skylark tilt-column would it then be possible to have the stop/directional option of using a single filament bulb for one, and the other for running lights? Is that what you were saying or do integrated directionals only work with double filament bulbs (like 1157s) in that case? I've been thinking that I'd have to use something like Pro's Pick LED bed lites for my directionals and the (2) single filament recepticles in the tail lights for the stop and running lights. Sure would be nice if I could opt for the former and use bed roll plugs instead.