2006 Freightliner Columbia

We have a 2006 Columbia last 6 of the vin V71908. For months now we have had continuing problems with marker lights. We have had several dealerships look at it, said they fixed it and they havnt. So now we are taking it upon our self's to fix it.

What we have done:
Found that the maker light base on the front left was no good. Replaced that, along with several wires were cracked and corroded to the point they were bad. Now we have cut and fixed those bad spots. How ever, we have maker lights on the visor, rear, and left and right side of the cab. The fronts we dont have any makers.

The turn signals on the front work, so the grounds are good to that point. We bought a power probe 3 to make it easier to try and find where our problems are.
The main harness is running on the passenger side of truck, inside of the frame rail. I have opened up the loom and with the help of the power probe was able to find the wire that controls the right front maker light. I also found the left front marker light wire.

Question, do these wires tie in to each other farther back in to the harness before they go in to the firewall?
I found a wire that i beleive is the marker light wire for everything. When i put power down the light with my power probe, all the makers but the front come on. How ever, when we turn the switch on to send power down to the lights i am not getting a reading. Yet the lights are on.

I am getting lost in my own brain at this point were the problem is. The wire that i found that i can turn the lights on with "injecting power down it" am i able to cut in and put new wires to the front markers from that wire.

 

Update : Fixed all of the problems except the two front marker lamps. I cant find where the marker lamp wire comes out of the firewall into a harness, any one have any idea?

 

We finally spliced in to the side marker lights on the cab, soldered them and covered. Ran new wires up front to the clearance light in the headlight and we have lights. Even the diagrams from the dealership didn't show what we needed. Hopefully problem solved. Will see when we hit the road.