Car audio: why won't left side speakers work in 98 gmc jimmy?

S T

New member
its beena while since i could hear my left side speakers, each located in the front and rear doors,,I bought a new factory radio, plugged it in in place of the old one,,,and i still can't hear my left side speakers,,,,and yes,, i've tried to balance/fade button......i wiggle the harness on back of the radio,,no luck....what could it be? thanks.
 
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