to one side of coil 80 of forward relay 70 the other side of coil 80 is connected to ground thus whenever the forward signal is generated on the forward signal line the coil of forward relay 70 is energized making a connection between contacts 66 and 74 of forward relay 70 at the same time the forward signal is applied via forward diode 78 to contact 54 of shuttle interlock relay 52 which when deenergized connects contact 54 to contact 56 of the shuttle interlock relay and thence to coil 58 of the shuttle interlock timing relay 60 since the other side of coil 58 of shuttle interlock timing relay 60 is connected to ground this causes the shuttle interlock timing relay to connect the twelve volt supply to contacts 66 and 68 of forward and reverse relays 70 and 72 respectively since coil 80 of forward relay 70 is also energized the forward solenoid signal is provided on line 38 and is conducted to the forward transmission solenoid 42 thereby energizing the forward and reverse shift valve 24 in a forward position and engaging transmission 14 in a forward gear ratio the reverse signal line is connected to the input of reverse diode 82 as well as to one side of coil 84 of reverse relay 72 the other side of coil 84 is connected.