LS1 Carb Swap - Tech
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...while the blue wire that's grouped with the other three non-terminating wires connects to the A/C compressor. This provides timing advance when idle is increased while the A/C compressor is running. The pink wire is the main power feed and should be run to a 12v "start" or "on" switched ignition source. The black wire connects to a good chassis ground and the yellow wire carries the tachometer output signal. View Related Article
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