Electrical Problems... NEED ADVICE!!!

[shellsaurora]

My 1998 Aurora has CONSTANT electrical problems and it is costing me a fortune. First my back blinkers did not work so I replaced ALL the car's lights, then afriend got in the trunk and jiggled the wires around- that fixed it temporarily.
NEXT the lights were all flashing and flickering on and off by themselves even after we pulled all the fuses- so I took it in and they replaced the multi function headlamp switch $700.
I get the car back thinking my electrical problems are over (aside from the back lock that will not auto unlock and the drivers power seat goes in all directions except for the one you direct it in!) BUT I pulled out and my right turn signal did not work. So I replaced ALL the bulbs again, NOTHING!- the front right blinker will not even light up, the back does but does not blink. So I replaced the flasher and fuses- NOTHING!!!!!........PLEASE DOES ANYBODY KNOW WHAT IS WRONG?
The dealership will not accept responsibility and wants to charge a fortune to rediagnose the electrical problem.