Hi all fitted a rns 315 to my mark 5 golf

Fitted an in-line converter and ran all cables

No sound from the sub. The amp turns on and off as should do

Fitted another amp and the same thing only seem to get 2.6v through the speaker cables and this doesn’t change with the volume

I have tried another sub another head unit with sub out and nothing

Any ideas I’m scratching my head

The amp shows 12v at power 12v when ignition on to the remote cable and the power light is on no matter what settings won’t play ball


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