My Tracer back up lights on one the driver side keeps shorting out. on 1998 Mercury Tracer

have check everything with wiring. Any suggest where I could find the bad connection? I have purchase different switches replace them. Please help single gal needing help.

Asked by for the 1998 Mercury Tracer
Is it blowing fuses or just bulbs? Is there any signs of water in the light assem.? Junk in the trunk?
I mean do you carry a lot of things in the trunk of your car that may contact wires ect.?
Does it only affect the one bulb when this happens?
SO......the other day my service advisor brings back a repair order and a part for a car......I ask him for the key."oh , the customer's got it" and then I asked him where's the customer?........ "oh.......They're not here"...........I'll never understand why people go to a circus for entertainment , when we have so much just at our jobs!!........let's see if we get a reply????