That brown wire IS the power to engage the clutch, it goes through some switches (ie ambient switch, control switch). Then without looking at a correct wiring diagram, the relay (if that is truely correct) to the "B" terminal of thermal limiter, where it comes out the dark green "C" to the compressor clutch, and the black off the compressor clutch provides the ground to engage clutch. The other black wire on thermal switch (Superheat Shut Off) will cause a short which will blow the little fuse inside thermal switch rendering no power out of the dark green wire.
I'll scan the info I have for my 73 today/tonight and post.
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