Welcome to the forum. It looks like the OP never updated this posting with any resolution to their problem so we may never know what their issue was (it may not be the same fault as yours either). Intermittent problems are the worst kind to troubleshoot. Try to provide as much detail about what is failing and under what specific conditions, if you know them.
Did any repair or changes occur to your coach last October when you noticed the problem first started? You mention the headlight switch......do the brake and signal lights work fine until you turn on parks or headlights; or when you do something else? The more details provided can help forum members assist you better.
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