Unfortunately , with Vanguard being a Canadian company; with limited sales into the USA; and not surviving the 2008 crash , there's going to be very little info on the internet.
For appliances you can try the appliance manufacturers web site , with the model number or this site.
www.myrvworks/manuals/
I had friends that worked at the Winfield BC , Vanguard plant , and was working at a Dodge dealership at the time and saw a great number of their product on Dodge chassis. Sometimes coach wiring could change with the worker building the RV so an exact wiring diagram isn't always possible .
If you have a specific problem and can post a picture , members here in the forums can probably help.
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