Sounds to me like it's time to drag out/figure out how to use a test light and/or a voltmeter. There's nothing "universal" about these older coaches, not to the point of providing much help in a response to a problem like this anyway.
Start at the battery by confirming it has power, than follow the power to see where it stops - that will very nearly always be where your problem is. Greatly simplified I know, but there's not much more that can be offered without some basic troubleshooting.
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1997 37' HR Endeavor, 275hp Cat, Freightliner
03 CR-V Blue Ox, Ready Brake
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