I have a 1997 Ford Expedition, which, when I bought it, only the speaker in back left door was working. The sound quality was fine, so I made do with just the one speaker. But a couple days ago, while the radio was playing, I heard a loud sharp pop, much like a gunshot, followed by a distinct electrical burning smell that faded away after about 30 seconds. The instant I heard the pop, the speaker stopped working, and it's been silent ever since.
The head unit seems to still be functioning fine. The radio was not playing very loud, so I don't think the speaker was blown, but I'm not sure how to begin trouble shooting. The only thing I did was pull out the speaker, which is a 4 ohm speaker, and run a resistance test on it. I got a steady 4 ohms, which I think means the speaker is still okay, but I'm not sure. Does anyone know what other tests I should try to figure out what broke?
I'm mechanically proficient, but I only have a very rudimentary understanding of electrical stuff, so while I can fix the problem once I know what it is, I just don't know how to go about diagnosing the issue. Any help would be so much appreciated!