I have 86 Monte Carlo ss when I turn the right turning signal on the signal light on the dash is blinking but when I get and look around the car the break lights are blinking and both of the front turning signals are blinking what should I do?

Good day, this is one of my favorite, but weird fixes!
The lamps on your old chevy are dual element type, one element for the parking lights and other for the brake/signal. When you turn the signal on, it separates the brake lights on that side from the rear brake light allowing the rear lamp to flash instead of constant on. What happens is that an element / filament has broken and 'droops' down into the other element filament and gives a weird and unpredictable short circuit between the parking lamps, brake light and signal lamp flasher. Have seen this many, many times. Quick, cheap and dirty fix is to get a box of replacement bulbs (they are cheap!) for all the dual element bulbs on the car - front and rear (sometimes even the markers) and replace them

Check socket ground