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84 C10 a/c help needed

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Old May 13, 2009 | 05:28 PM
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Default 84 C10 a/c help needed

I'm trying to wire up the a/c in my 84 w/ a 5.3 from an 07 Silverado. I wanted to reuse the factory low pressure cutoff switch on the dryer. There are two wires coming out of the switch - one + 12v & a second that should complete the circuit and activate the switch. My question is where should that lead be wired to? I was told to connect it to the relay for the a/c comp but I don't know which of the four terminals to connect to. I'd rather wire it into the relay than directly to the compressor as the engine harness is factory and I have a relay center near the ECU (as wired by current performance wiring).
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Old May 14, 2009 | 12:35 AM
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What ECU are you using? Are you using DBW or cable?
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Old May 17, 2009 | 09:37 PM
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Using stock 07 truck ECU (DBW).
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Old Jul 21, 2009 | 03:50 PM
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The low pressure switch should have (-) voltage on both prongs. It simply completes the negative circuit to the compressor once the switch closes (pressure is good)
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