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Your wire harness is a large set of wires behind your dash that is connected to all your electrical components. You also have a wire harness under the hood. Called a engine harness.
Check your fuse in fuse box. If all stop working at the same time.
Trying to convert a 03 manual hvac to 07. Both units are manual but the connectors and wire order are different. Do you no the color codes for both? Upgrades are clock, hazard switch, outside air temperature, blower and ac......outside air was not originally in the 03 but being added because of unit. Is this possible? I have already added the sensor to the engine wire harness.