[68c10airstream]

Hey highway by the sea, just checked my stock 68 c10 and wire the side markers the way gm designed them to operate: Headlight switch off, turn signals on/ 4 way flasher the side markers turn on at the same time, headlight switch pulled out, side markers are off when the turn signal lights up, then when the turn signal light turns off the side marker turns on. The lesson here is if wired this way always make sure the front park/turn signal bulbs work properly before repairing the side markers. I believe gm did this to get the attention of people to avoid accidents as alternating lights between side markers flashing and turn signals flashing is really hard not to notice. If you want me to check for sure i can later as i'm tired and going to bed, wife and i have worked on our house for days on end to get ready for winter! Good luck, Brian F.