Marker light wiring question

[Tdrcreyn4]

Can anyone tell me how the original cab marker lights were wired? I have looked over the wiring diagrams for the C30 - 60's because I don't see a diagram under the C/K 10/20 diagrams. I'm just trying to make sure there weren't any differences between the big trucks and the 10/20 series with marker lights. Makes sense to me that they should be on the same circuit as the running lights/side marker lights. I'd appreciate some feedback please. Thanks in advance.