First, i'd be very cautious about altering hoist controls especially if personnel are involved.
It could present a hazardous situation.
You didn't say what the voltage or current is but you should ideally use a reversing contactor. They are mechanically interlocked to prevent inadvertently enabling both up at down at the same time and are designed for heavy motor currents.
Basically wires 12 and 9 would be on one contact for "up" and also on the same relay (contactor) will be 11 and 10 on another contact.
similarly, the wiring on the other sides of switch would go to your "down" contactor.
Another safe wiring practice is to electrically interlock the energizing coil of one contactor direction with a normal closed contact of the opposite direction contactor.
Thanks John
To control the hoist I had ordered a control box made for my use back home.
The control box comes with two set of wired soft touch keys and one wireless switch that can control the motor from two different locations. On the control box, there are two input terminals to power it up and 8 output terminals as follow:
2 terminals to power the electric motor
2 terminals to control rotation of the motor
2 terminals to connect up and down limit switches
1 terminal for emergency stop
What I realized was that unlike the motor back home electrical motor I got has only 3 input wires (2 capacitors connected in parallel are connected in series to one of the wires); despite trying all sorts of configuration to replicate 4 wire connect, I had no success, I only hear humming noise from the motor when I press up or down buttons, motor doesnt turn at all!
So I got an idea, tested left and right output terminals with the neutral terminal, I observed that 110v voltage present when up or down buttons press.
Now if I connect those terminals to two relays that are connected to pendent’s up an down circuits this configuration meets my needs.
The control box already has the limiting switches terminals.
So when I press up or down keys respective control rotation terminal will have voltage that could turn on the relay.
If I understood your direction, based on the output I get from the control box I would need two 4 pin relays (2 pin to charge the coil and the other pair to connect up or down circuit)
Question: if only pins 9&12 and 10&11 are to be connect to control up and down circuit why wire 9 is common between up and Dow circuit?
Thanks
Sorry for long email