I have a 92 camaro rs sometimes it starts perfectly and then sometimes I try to start it and it's like if it didn't have a battery on it the lights wont turn on the windows wwont go down Nd the radio what can be he problem can any one please help

 

Sometimes just taking off the cables from the battery and cleaning up the contact areas with a wire brush until nice and shiny and reattaching tightly will make a big difference. Pretty easy and can't hurt. Also check all the connections at the junction block about a foot away from the battery where everything gets it's juice. Take the 10mm nut off, take the wires off and clean them up if needed before putting back together

 

Actually me and my dad just did that and that was one of the problems and we changed the terminals and no it starts everytime.