Jerry I have a double socket tail light and I was running the same single bulb filament for turn signal and brake and the other single bulb filament for tail lights. The turn signal looks like it was original to the truck but was in a box of stuff when I bought it and not hooked up so it probably doesn't have the discriminator switch you mention. Are you saying I should have a double filament bulb for my tail light so the other filament will work the brake light?
Greg
