(((help speakers not playing)))

for some reason my d-pillar speakers and my factory subwoofer stopped working. i replaced the d pillar speakers and after about 6mths they quit playing. thinking they were blown i just bought another pair of bullet tweeter for like 20 bucks from a friend. those didnt work either so i tested both sets of speakers on the house stereo and they both played pretty well. then i thought to check my factory sub connection to se if they were good(factory sub has been disconnected before any of this happened)but they were not powering the tweeters either. i checked fuses under the hood and inside by the dash and there was a fuse blown but had nothing to do with the audio, and after replacing it , had no effect. am i missing something. could one of those huge black fuses be bad. can i just pull them out . how do i check them. ANY feedback would be greatly appreciated.

factory amp? if so, it could be bad....and keeps blowing speakers...

yeah but why hasnt it blown the doors speaker and isnt the factory sub and d-pillar speakers on different channels? also where is te factory amp located on a 2001 gmc yukon 5.3l (new body style)?

The channels may be bad. Do you have a DMM(digital multimeter)?

Measure the AC voltage at the speaker wires. See if you get anything.