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You might be encountering a "too much resistance" problem. I think that the computer puts out minimal amperage and it just may not have enough oomph to get the power to the switch and back. Couple that with the electrical noise that is inherent in a car environment and you have a problem. I suggest installing an "rca" connector onto you 3" mobo wires and another "rca" connector onto your switch. Put a shielded RCA cable (like what is used to connect amplifiers to head units) between the two. Those cables are made for low power and also low interference.
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