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We expect that some manufacturers will be making wiring diagrams available for the 2010 model year. For the most part there was not ever any wiring diagram for the house portion of motor homes and the chassis system will have been modified and tapped into so they could get power to run the house. There are diagrams for each individual 12 volt powered appliance and the house 120 volt wiring runs like home wiring. To repair new units we call the factory and speak to someone that actually ran the wires for the unit we are working on. Not realy a efective thing for a 23 year old unit. The manufactures of your appliances will be happy to provide wiring diagrams and requirements if you ask them. Other wise its a case of tracing wires and using a meter. Good Luck