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Hi! My name is ***** ***** I can assist you with this. I may need some additional information from you first in order to give a complete answer.
What is the actual problem? And which "processor" are you referring to here? Get back to me with some additional information and I can assist you further here. All follow ups are included in our fee.
If you need a good chassis manual and wiring diagrams, I would check with Faxon or Lloyd's first as both are good sources and I have used them in my own shop. I am adding links to those sites for you. http://www.faxonautoliterature.com/
I didn't notice that you had asked this a few days ago. I would respond to the first post and let this one go. I can tell you it appears that the problem is in the disconnect solenoids or the switches or the batteries are not wired up correctly.
Most are located under the hood in the Battery Load Center OR near the batteries, depending on the OEM and the chassis. Most are made by Intellitec and I am adding a link to a photo of one. https://www.bing.com/images/search?q=intellitec+disconnect+solenoid&id=6784F0A3957A7E2906BBAB5976F1C0EB65EA56AE&FORM=IQFRBA
Most have at least one fuse on them and they won't work if that is blown.
They would have to come from Rexhall. None of us here would have them. I am adding a link to that information for you. Not certain they are still in business. http://rexhall.com/
I did call them and all those are gone now and they are getting ready to close down. That means that they would have to come from a dealership that had a large Service Dept.