Educate me: What is the pupose of cab roof marker lights?

[SS Tim]

Originally Posted by JJorgensen52

So new question, just got home with a '67 C-30 parts truck, which is a factory DRW but has no roof lights - should it have had them originally?

Don't think it would have been built with them as standard but probably would have had them added to meet regulations somewhere in its working life.

67MY was a transition year for lighting and the factory pretty much built to the federal minimums that soon changed. Many of the heavier trucks still only had a pair of roof marker lights if that. There is no indication in what I just went through in my 67 docs that the five roof clearance lamps were anything but an option (RPO U01). However it is very clear about the positioning with a dimensioned diagram. Below is a brochure clip showing a factory platform/stake dually without markers or even the bed clearance lamps only reflectors. Granted it is artwork and subject to some variations.