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This is pages 2-113 & 2-114 from printed TM-9-2320-260-20 July 1972 in the electrical troubleshooting section.

There is also a #27 spider harness which is the power to the electric gauges and is keyed hot by the battery switch.

Sweet! Any chance you measured voltage for bright vs dim? I don't plan on cutting anything. I'm hoping to unplug 569 from the pre-heater switch, plug it into a wye, then add a short section of wire from the wye back to the switch and then another section of wire to a USB port.

I've been wanting to add a 12V charging port for cell phones on my M813 also and I've been entertaining the idea of splicing in to the "glow plug" circuit #569 with a wye connector just before the switch since it already carries 12V to the dash. Not sure if it's a sound idea but it would be...

This is just a guess, but I'm thinking that circuit #40 might output 2 different voltages based on whether the light switch is on Panel Bright vs Panel Dim. Not sure what your converter would do if it were receiving 12 volts, say, instead of 24 V. A volt meter in that free socket would confirm...