I have a 2002 nissan altima, i repaired alot of senors and parts for the car and im having an issue where my radio, low beam headlights and turn signal stop working. i have tried everything. i even went as far as buying a used ECM that didn't even work. so im here hoping you might have and idea i didn't try.

No. 1-1

check for a worn ignition switch first, that's most common as it powers all those with many different wires. And also check for ground wiring shorts, as they can effect systems that same wiay since they power many different devices at the same time