I do have power.
I do have signal in from the head unit.
I do NOT have signal out to the door speakers.

Is there a way I can test it by testing continuity in throughput, etc?

I can hardwire (bypass) the amp and I do have sound.

Thanks

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1994 C280, dark green metallic
105k miles

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(sold to another forum member)

2003 Chevy Tahoe LT, Redfire Metallic
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43k miles