The switch is actuated by the upper throttle lever, above the pedal, just below the cable attachment. When a 12 volt (B+ voltage) signal is applied to the solenoid, it activates, opening a valve and dumping pressure to the 2-3 shift valve, causing spring pressure to move the shift valve to the 2nd gear position, thus causing the transmission to downshift from 3rd to 2nd. Fused wire to the kick-down switch, mounted above the throttle pedal, from the switch through the bulkhead to the pass-through connector on the left side of the transmission case, just above and slightly rear of the manual valve (shift linkage) shaft, through that case connector to the downshift solenoid, mounted on the seperator plate near the front pump. The electrical circuit for the THM400 is a simple, one-wire system.
