Line out converter problems!

[Ras3]

Well I decided to rewire my car today and bought a new line out converter I hooked it up correct to both rear speakers + and -. My system worked fine before but now when I crank it up my indoor speakers plus sub cut off but when I open the trunk the system comes back on??? The only thing that I changed was the line out converter and the wires from the deck speakers to the LOC. If I used to small of a wire running from the deck speakers to the LOC would that cause a problem?

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