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You have 3 cables entering the box. Each cable has black and white and ground wire. You have a single pole switch. The switch has 2 brass-colored screws and 1 green-colored screw.
1) One thing is certain: all the ground wires connect together and then connect to green screw on switch.
2) After that, we are guessing without more information. Add a comment.
3) What does the switch control?
4) If the switch controls a hallway light, and there is another switch for the same light: then you have wrong switch. You need 3-way switch. Buy 3-way switch and re-post question at fixya.
5) If switch controls a bath fan-light combo, repost question at fixya.
6) If the switch controls a regular light, and no other switch is involved: then the following information might work. Or you need to do testing and re-post another question at fixya.
-White wires probably connect together and are covered with a wire nut.
-Then two black wires connect to one brass screw and 1 black wire connects to other brass screw.
-But which black wire?
-Only one of the black wires has power from circuit breaker. That is hot wire. -Hot wire connects to 1st brass screw on switch. Either screw.
-And then connect one of the other black wires to 2nd brass screw. Turn on power and see if light turns on. -Try other black wire same way. -The black wire(s) that turn on lights on should be left connected to 2nd brass screw. -If one black wire did not turn on lights, then that wire probably connects to 1st brass screw along with hot wire.
If you want to control both the light and the fan using 3-ways, then just wire 2 sets of the 3-way circuits. For this you need two sets of 3-wire between the switches, and one 3-wire cable from the switch location to the fan/light box.
At box #1 (a 2 gang box), you will run a power cable (marked cable #1) into it. From there you run 2 sets of 3-wire cables (identified as cable #2 & cable #3) to the other switch location, which will also be a 2-gang box (box #2).
Also from box #1, you will run a 3-wire cable (cable #4) to the fan/light box (box #3).
Hook up is as follows:
Box #3: connect black of cable #4 to black (fan), connect red of cable #4 to blue (light), connect white of cable #4 to white (fan/light), and connect the bare to the green.
Box #2: Connect white of cable #2 to identified terminal on 1st 3-way switch (#3). Connect red & black of cable #2 to the remaining screws of 3-way switch #3. Next connect white of cable #3 to identified terminal of 2nd 3-way switch (#4), and connect black and red to remaining screws. Tie all grounds together and terminate to both switches.
At box #1, connect black from cable #1 to whites in cables #2 & #3, using a wirenut. Connect white in cable #1 to white in cable #4. Connect black and red in cable #2 to 3rd 3-way switch (#1) and connect black and red in cable #3 to 4th 3-way switch (#2). Connect black in cable #4 to identified terminal of 3-way switch #1, and connect red in cable #4 to identified terminal on 3-way switch #2. Tie all grounds together and to the switches
Old timer: Intermatic EJ500 & ST01C timers have a battery. Battery operates the clock motor. Red wire is for 3-way circuit [a hallway with 2 switches is a 3-way circuit].
Utilitec timer, clock runs on 120Volt circuit instead of battery. So clock has to have power.
How to connect wires: Black timer wire connects to hot wire from breaker box. Red (or blue) timer wire goes to landscape lights. White timer wire connects to white neutral wire [or if no neutral is available, connect to bare ground wire]. Green timer wire goes to bare ground wire. How to find black hot wire and white neutral wire inside box: Disconnect and separate wires so you can test. Use ordinary tester. Power is on. There is only 1 black hot wire inside each electrical box. Test each black wire to bare ground until tester light comes on > that identifies the black hot wire. Next, test black hot wire to white wires until tester light comes on > that is the neutral wire. Exception: This test does not necessarily work with 3-way switches since they reverse each time switch is thrown.
Red - Power (to ACC in vehicle)
Black - Ground
Yellow - 12V positive (battery lead)
Blue/White - External Amplifier Control Lead
White - Left Front Spkr +
White/Black - Left Front Spkr -
Gray - Right Front Spkr +
Gray/Black - Right Front Spkr -
Green - Left Rear Spkr +
Green/Black - Left Rear Spkr -
Violet - Right Rear Spkr +
Violet/Black - Right Rear Spkr -
The red and white RCA pigtail leads is for AUX input
Left set of Preamp Outputs - Rear Channels
Right set of Preamp Outputs - Front Channels
Only Models C3433U, C3304U, and C3333U have a 2nd set of RCA pigtail leads for subwoofer output.
Pull out the plastic pieces (green , red and black) and pull slow out the red wires come from fly back, box focus-screen and 3 red wires from CTR. Keep attention in position wires ( for put it back). You will take out 2 screws for splitter box ( one in the front other in the back side)