Gotta 94 century special and the master switch went out inthe driver's door. Ordered a new one, but I cannot find a good enough wiring diagram to that tells me where each wire goes. My problem is that there are 3 sets of the same colored wire. (2-black, 2-brown, and 2-purple) I need to know how to check that I'm connecting the correct black wire from the module to the correct black wire in the door. Any suggestions?

Just look at wiring and label if needed while installing new switch. Or you can do 1 wire at a time. You may want to disconnect battery before starting this...at least have key 'off'/out (ie. not listening to the car radio while doing this)

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Here's the plug pinout Bro,

Cavity Color Function
C1
A Black Ground for Illumination
B Gray Power for Illumination
H Violet RR switch
K Violet LR switch
L Brown Ignition power

C2
A Blue LF Motor
B Blue RF switch
C Black Ground
D Tan RF switch
E Brown LF Motor
G Green LR switch
H Lt Grn RR switch

Had to edit because I left out C1 A&B for Illumination
Good luck, Imp