brake lamp wiring for chevy blazer 97

Hello,

This is the first time I have posted here so if I get it wrong I apologise in advance !!

I have a 1997 chevy blazer 

my problem is the brake lamp isn't going on.I check the brake switch there are orange, white ,BLACK/ white & violet

wires.orange & white is push on switch but BLACK/ white & violet is push off.voltage in the brake switch is not have problem I think

because hazard light have aproblem like the brake lamp,it's not going on.I checked relays boxes under head unit there are 4 pcs and

all of it is good.all fuses in the fuses boxes & all bulb is good.

Many thanks for reading this, best regards to all,jimmy

Thanks….I thought the white wire from brakeswitch not through to the brake bulb but it's go to the other circuit because if i give power(positive trigger from battery)at bulb, one of relay in relay boxes is active,and buzzer is on too, but bulb still not goin on.the meaning is nothing open circuit at there.most cars not like that, wire from brake switch always through to all brake bulb.I’ll try to check white wire connection again,thanks for your help……………

                                                                                                Best regards

                                                                                                      Jimmy