brake lights

[Moosifer]

Nothing high tech here yet just tryin to get the brake lights to work. Flashers, turn signals, running lights work fine, new brake light switch installed, traced the wires from back to front, all the fuses are good, what am I missing here? I have a 90 Silverado, 350/700R4, 2500.
I've had this truck almost 10 years, painted it last year, doing engine and tranny mods this year and have joined this forum in the hopes on not making the mistakes others have had to endure.
Thanks for you assistance.

 

[glfirefighter144]

Check relays?

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[1997k1500Calvin]

Check the wires going to the brake light switch I had the wires like 2 feet in the dash get twisted and cut magically took me forever to figure it out..start there...also make sure the plugs going into the brake light switch are in tight....also happen to me

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[IOWNJUNK]

Check for a boogered up trailer harness.

 

[stenny]

i am having same issue in my 92 k1500 by the repair manual white wire on brake switch is gor brake light but on my truck purple is the brake wire and someone cut my orange wire