You should be able to get any information you need on the chassis from your local Freightliner Dealer.
What specific is the problem?
Most problems with electrical are ground or poor connections. The wiring is only exposed at these locations. Poor fuse contact, or weak solenoids, can usually be diagnosed easily.
"LOVE and LOSS, are two of the greatest emotions one can experience. -- I went to school to learn about "WHAT GOES UP MUST COME DOWN" but I had to live my life to learn the lesson of: 'WITH LOVE THERE WILL BE SORROW'."
David Stewart. (after loosing my NAVIGATOR)