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Those siamesed wires appear more like light blue and light green in that image. They are in the torque converter clutch circuit of an MV4 (TH350C) or MD8 (700R4) transmission. Is there a free-hanging orange connector with one light green wire in the vicinity of the fuse box?
Yep! Dark green/light green pair; looks like it connects the dash switch to the fuel tank selector valve mounted under the cab.