Usually you have to have the key on the have power at the blue wire on 8600's. Honestly, it's not legal to disable the trailer ABS (and can cost you thousands in fines if caught).
What I would suggest is as follows: two of the 7 wires in your pigtail are for the marker/tail/clearance lights - the brown and the black wires. Tie these two together to the same post on the front of the trailer (at the back of the plug). Then take the interior panel behind the driver's seat loose or out to access the back of the tractor plug. Put whichever wire you're NOT using at the front of the trailer on a switch inside the cab. This makes the empty pin at the trailer on the switch - just wire the aux light back to that pin. Easy-peasy.
Spade - your local big truck mechanic
This post was edited by Spade - IN at 14:51:50 10/01/12.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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