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The light green/red wire at the brake on/off switch should have 12v. This is supplied by fuse 11 in the interior fuse panel.
Once you apply the brakes, the dark green wire is energized at the brake switch. It then travels to fuse 39(10 amp) inside the interior fuse panel and becomes a light green wire that travels back to the rear brake lamps.
You also may want to remove and clean the black wire(G400) that controls the ground side of the lamps. My schematic describes G400 as being located "at left side of vehicle rear end".
Hope this helps...