usually the signals are keyed, the brake power constant, and the brake lights actually go via the signal switch, which interrupts the brake signal when on ... it's actually the brake filament that's blinking - don't have a shop manual wiring diagram?

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