Re: Turn signal, brake light, blinker issues
You're going to have to check a number of things first.
Does it do this every time you put it in reverse regardless of lights or not? (engine vs. electrical issues).
What is the shape of the wiring? Factory original, un-touched? Factory "modified" by a previous person? Aftermarket? In shambles?
As stated above let us know what ignition set-up you have and HOW it's wired. One possible cause is the main bulkhead connector that links the underhood wiring to the interior is loose/dirty/corroded and the main Battery power feed doesn't have a good connection, extra loads are causing a large voltage drop and then your car electrical circuits suffer due to this poor connection.
-If you don't stand for something, you'll fall for anything.