1996 Blazer speakers have no sound?
 

I was getting my door striker re welded because the bad door pins slowly fatigued the metal out of place, never had the battery disconnected i'm quite sure but after wards everything worked great, besides the radio, The speakers had no sound so i removed my panels dropped the steering wheel and tested a known good radio, still the same issue? so i'm guessing there is a factory amp somewhere in this vehicle that has either gave up the ghost or not getting power. Would anyone know if the 1996 Chevy blazer LT would have a onboard amp somewhere? By the way this Blazer had a very high end Delco radio in it when i got it and also has keyless entry so it would not be a stretch for it to have a sort of Bose system in it. Please advise i would appreciate i

I should mention maybe that i removed he factory radio ages ago and installed a PIONEER head unit, and tested with a JVC & Kenwood radio

Update, with new radio installed, When i shut the door and the courtesy lights turn off (truck running) the speakers will all make a tiny tidbit of sound about 1/2 a second of the current song i am playing over bluetooth/aux i would say FM/AM but i dont know whats playing. Please advise

Another update when i flex the door striker on the lf, the sound wll come back so i guess the harness was melted from the heat of t\he welder