What possible wires could be bad, leading to my AC compressor? on 2006 Kia Sorento

I had a new AC compressor put in my '06 Sorento after recharging the old one and it still didn't work. The new one doesn't work unless hooked directly to a power source, leading me to believe wiring is involved. What is the best way to find out which wire, if any, is the cause?

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