In order to troubleshoot a dead car speaker, a multimeter is needed to check to see if the speaker is working at all or if it needs to be replaced. Check car speakers by removing door panels with help from an auto mechanic in this free video on car repair and diagnostics. Expert: Tom Brintzenhofe Bio: Tom Brintzenhofe has been a mechanic for more than 17 years. Filmmaker: Reel Media LLC

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Temporary connect a small 9 volt battery to the disconnected speaker, this is a good way of checking if the speaker is working and its polarity. The Speaker cone should move forward if the battery polarity is correctly connected to the speaker.
I have had a couple of problems with trapped /shorted and damp speaker cables . This would give me the same reading you were looking for . I think the best way Is to remove the stereo and do a continuity test between the speaker and stereo/amp.
just un-plug your dead speaker and show it in the speaker shop.
how much r those things ? to check the car radio????????and can i use a old speaker to replace or do i need to buy a specific speaker?