Have no tailights but do have brake, reverse and clearance. I'm without a diagram, signed up for Access Freightliner which alledgedly will allow me access to schematics after a month of waiting but meanwhile I guessed and replaced the module for exterior lighting. $331.00 for nothing. If I power cigarette lighter externally, I get tail lights. Anyone have any tail light circuit diagrams, know how cigarette lighter is a part of this circuit or can confirm joining Access Freightliner gets me electrical diagrams? Thanks in advance for any help available.