Hi. I asked my spokesman for a schematic when I bought my tt a few weeks ago. He said there isn't such a thing and that it just depends in who wired it that day. That being said. With your current situation I would think the factory could supply you with a point to point schematic that might lead you in the right direction.
I was the main electrical repair guy for my local Caterpillar dealer until i recently retired. If you buy a Power Probe, it would help you locate which wire is which. After using a volt meter to locate the ground wires, (remember to remove your bulbs or a hot wire will show up as a ground through the light bulb or LED) you could energize your hot wires and identify each circuit.
I bought my Power Probe a few years ago. It was the older model series 3 and was $60.
I hope this helps. I'm more of a doer than a teacher.
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