93 deville electrical problems
 

Hello everyone,
We just got a 93 sedan deville. I have been finding some electrical problems such as the electric push button door locks on all doors do not work (when you turn off the engine all doors unlock but will not relock with the push button) I have found a work around for this by leaving the car in gear-shut off the engine-then using the manual door lock to unlock the door-put the car in Park-turn the key completely off and remove-then manually lock the one car door--problem is, I have to manually unlock the back doors by reaching in-it's quite a stretch, the trunk release in the glove box doesn't work, when I turn on the Twilight Sentinel the dash lights dim, the standard cassette/radio went whacko and doesn't work at all now display lights started flashing then went black, no radio also means no cassette player and antenna doesn't go up.
This is just what I have found so far.
All fuses are solid with no signs of weakness. I have not checked the relays yet. What could be causing all of these different problems?
Please help!