Power Acessories Not Working (Radio, Turn Signals, Clock, etc.)

[RiflemanX]

I need some help. I have a 95 240sx with an SR20 DET (S13) swap. I have had it for several years now and have never had any issues with the electronics until retuning home recently from Iraq. It worked fine prior to storage and whe I returned home it would not start. I replaced the stock ECU with an aftermarket tuned Blitz ECU and of course it just turned out to be an igniter chip. After replacing ECU and igniter chip the car ran great and had no problems for about 1 week. Now, suddenly all the power accessories are not working. There is no power to the radio, clock, interior lights, electnoic chimes, or turn signals. Also the gas gauge reads far below empty. I checked all the fuses and they are good to go. What is the issue? I was thinking perhaps a relay, but I swapped them between each other and got nothing. I also checked the connections from the battery, but I have not put them to a volt meter. I don't really have all the test equipment required. Is it possible that there is a ground wire issue? Should I just replace the relays anyway? Where should I start?