I have a 2003 Monte Carlo Ls I replaced the bulbs checked all 3 fuse boxes with multimeter no bad fuses. Attempted to start car while in reverse won't start meaning that reverse neutral safety switch should be good any other suggestions right off the bat? Please let me know

 

Check for corrosion on the sockets, then check for voltage and work your way up.

 

That was it thanks for the help corrosion on paddles hard to see

 

Glad I could help. Cheers!