got a shop manual? colors should be the same as factory and the factory wiring diagram has colors marked .... earlier units yellow goes to the flasher unit - if you put an ohmeter on green wire to ground and press the horn, it should show a short if that's the horn wire

Bill

Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics