Nissan Repair: electrical failure, electrical failure, fusible links

Question
im replying to your answer . my car still runs  but when  i let off the switch the accessories still dont function.are there any more causes other than the ignition switch or fusible links which are sparking

Answer
There are different relays that run the assessories you mentioned and all of them would not have blown all at the same time.  So, if you go upstream of the electrical there are only the fuesable links and the ignition switch.  I did work on a 240SX that had a blocked converter that got the floor so hot that it grounded the electrical wires to the floor pan for the electric seat and that caused the systems to fail.  I ended up taking the driver seat out and pulling up the melted carpet to find the cooked wire and rewired the burnt section and all the electrical goodies you mentioned started working again.