1. If the dimmer switch you are talking about is the high/low beam switch switch on the floor the only wire that needs to be in the correct position is the blue wire that supplies the 12v positive power to the switch. It is a Single Pole Double Throw (SPDT) switch. It has a single 12 volt positive input(BLUE) and can connect to and switch between the 2 outputs TAN or GREEN. The tan and the green wires go to the bulbs. When you click the switch it switches the power from the tan to the green or vice versa. The tan and green wires can be swapped and the switch is still going to operate.
2. The A/C switch is a normally open single pole single throw (SPST) switch. A Single Pole Single Throw (SPST) switch is a switch that only has a single input and can connect only to one output. The circuit is open until the switch is physically moved into the run position which closes the contacts inside the switch and makes a connection. It does not matter which two wire connector is plugged in to because it simply connects the two wires when the switch pushed.
3. The brake switch is a bit more confusing to explain. It is a normally closed switch meaning when the button on the switch is not being pressed down the contacts inside the switch are connecting the orange and white wires. When you are not pressing the brake pedal the button on the switch IS being held down which keeps the orange and white wires disconnected from each other. When you press the brake the button is released and the orange & white wires are being connect by the switch. The part of the switch being used for the brake lights is also a SPST switch so it does not matter which way the two wire connector is plugged in. It simply connects the white & orange when the brake is pressed.
Hope this explains.
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