I have installed new harnesses on the Camaro.
I do have turn signals, brake lights, high and low beams but do not have reverse lights at all.
Does anyone have a suggestion?

 

I used a rocker switch with a light that is on if the lights are on. Wired to the keyed source in the fuse box.

 

You need to clarify your question...
Does your car physically not have reverse lights?
Or, does the new harness not have provisions for reverse lights?
Or, is everything hooked up like it should be, but they just don't work?

 

sounds like the reverse light switch isn't installed properly.