dei 530t window up/down module

Found the connections for the drivers door but where is the best connections for the passenger? At the passenger door? There are two harnesses at the drivers kick panel according to my sources but what worked best for you?

Oh and this is on a 2004 Mustang

  I've installed the 530t box all the time, first check the power window at the driver's switch with a meter to see what polarity they rest at. OK if they rest at (-) ground or if the wires rest open, then just run the wires from the 530t box right over to the driver's side switch and mount the unit in the driver side kick. Now if the wires rest at 12v when the ignition is on, then it is necessary to run wires in to each door( driver and passenger ) If not, the master (driver's door ) switch will work, but the switches in the other doors will not.

Are you sure you have to run the wires in each door?