One Dash Speaker Not Working

[DrCactus]

I agree with Burg, thats your quickest test - if the speaker works then you will know its either the wire or the amp channel... then go to your amp and hook speaker up directly to the AMP with a new wire and if it works then you know you need to run new wire from your AMP back to your dash... if the speaker doesn't work when directly hooked to amp then you need to just replace your Amp most likely.