Who knows how to check speaker wire polarity?
Ladies and gents, I'm in the middle of changing out TVs, both front and rear on our '04 Itasca Horizon 36GD with the C-7 330HP CAT. Now, a small amount of history here. Winne and Itasca, in that era...
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any Home Depot or Lowes has Tone Generators, mine reads out on a dc meter. use it to trace wires on fire and burg systems on a daily job. You may have to switch to the continuity checker part on some models to get a dc out.
https://www.lowes.com/search?searchTerm=tone+generator
http://www.homedepot.com/s/tone+generator?NCNI-5
https://www.lowes.com/search?searchTerm=tone+generator
http://www.homedepot.com/s/tone+generator?NCNI-5
