Joe...
If all else fails, it may behoove you to make your own diagram as then you will know for sure where all wiring leads and what's connected to each. A simple light bulb testor or a digital voltmeter will be a basic approach to testing, putting power to each wire run, one-by-one.
Second thought: a tone tester (as found among the telecom gear at any big box DIY store) would be a more difinitive means of identifying circuits.