dei 530t dual switch

No this will give you one-touch on both. Look at my revision of your drawing:- 1E7_untitled.bmp N.B. Yellow represents white.

How can white go to the motor? According to the 530T manual white is a light gauge wire and is the down switch? And same for brown

You're right I'm doing this from memory the small gauge wires go to the switch of course. The point I'm making is that the slave switch motor outputs go to the 530 small gauge wires. Your diagram showed them as joined. the reason being that at rest, type "A" switching the master motor wires rest at ground, therefore they are "seen" by the slave switch as ground wires and the slave motor wires go to the small-gauge 530 wires. On the slave switch the inputs are NOT connected to the motor wires as erroneously shown in your diagram, only a small point but it will save you loads of blown fuses and cursing!

The motors in this vehicle are two lines and use the chassis as ground. I'm just trying to figure out how I can wire one switch through the other and make it work. Let me clarify a little bit. The motors have 2 + inputs and use the frame for grounding. + on one line goes up and + on the other line goes down

Ouch! Try and verify how the original switch would be wired.