electrical wire marking code?

[robertglines1]

I a little confused and embarrassed to ask this question. I have the prevost wiring harness that was burned into.  I am repairing it.  Each wire is marked with circuit every few inches.   some have -> before the number  example  ->23    which is Rh turn signal   .  does this -> mean the direction the wire is traveling from the last terminal?  In this harness they have different wires marked both directions ;not the same wire.  To clarify it was not shorted in to but burned by a fire.  A new one is very expensive and I have time.    Bob

[prevosman]

Bob,

I cannot answer it, but Prevost can and will answer your question. That's a generic question because Prevost has used the same method of coloring and makring wires forever. I have called Quebec and gotten their engineering folks on the line to answer questions such as that, although I suspect any of the service centers can answer the questions.

Red is 24 volt, yellow is 12 volt, each number corresponds to a specific function and that number can be found on all coaches, including the new ones with multiplex. If you pull up the electrical diagrams for your coach on line (be patient, it is all there just do what I have done and blow them up and create bigger master drawings by pasting "tiles") you may have the answer at your fingertips.

[robertglines1]

Got all the paper work- appears to follow the pattern when it leaves a junction box the arrow changes to direction of travel to next destination.  Cool.  when something is cut in half and you are connecting multiple boxes. Also when clearance/running light signals are run from front box to rear then distributed forward same wiring harness a piece. so many UN used wires and spares--4 differant configurations for Jake brake alone.  Got my head around it now.(scary thought)  .

[prevosman]

It's only scary until you have that eureka moment and the logic of what Prevost did becomes apparent.

The extra unused wires are there for future use, or in the case of what might appear to be duplicates to accomodate variations in options or components.

The biggest system to confuse owners is usually the level low system and if your coach has that system it will tend to drive you nuts when the bus starts to develop the "leans". However as soon as you grasp the operating concept of the leveling system and understand the function of the various valves maintaining it gets very simple.

Where most people get frustrated is they see the bus as this big complex assembly and it is actually a set of relatively simple systems and devices all hooked together running down the road.