Working with the TS half of the TS harness connector. with the stalk in neutral there should be continuity between the white wire (which is coming from the brake light switch) and the 2 wires to the R & L rear brake/ts large filaments. with the stalk raised one of those 2 wires should go dead & another seperate one gets hot which is to the TS flasher. With the stalk down the first wire to the rear that went dead should be now be hot again and either the same wire to the flasher that got hot when you raised the stalk or another wire to the same flasher gets hot (I ain't sure/check the diagram). #1 I'd find out if the TS harness/switch mechanism under the st wheel is good or bad & go from there