I got your PM.
Since you're having trouble with that 1 speaker, time to try some different things.
1. remove the bad speaker and turn on your system with 3 working speakers. does it turn itself off? if no, then you've isolated that problem to that speaker or speaker wiring.
2. remove the bad speaker and put back the old speaker. does it sound distorted? is it making the same noise the new speaker does? if yes, then you have a wiring problem. if no, then you have a speaker problem.
3. take the bad speaker and move it to the other side of the car. swap the bad speaker in a working location and try testing the sound. does the bad speaker remain broken in the known working location? if yes, then you have a bad speaker. if no, then you have bad wiring on the other side of the car.
- if it's a wiring problem, you need to double check your wire connections coming from the radio. make sure all connections are soldered and properly wrapped. also, make sure there are no breaks in the wires where it can be exposed to bare metal.
- if it's a speaker problem, you need to still check your wiring. something caused that speaker to go bad and it's rare for a factory speaker to come blown out. (unless you got a floor model, purchased it from eBay, or got a mismanaged store return)