Strip the last one inch of your new black wire and place all three black wires together. Replacing your old light switch with a 20 amp switch isnt a bad idea.
Controlling A Fan Light Combo And A Vanity With Two Switches
Fan and light on same switch. The power source will either enter at the switch box or up at the light fixture or the exhaust fan. The key factor is to understand where the power source enters the circuit. The electrical wiring for separate switching of the bathroom exhaust fan and the light fixture will require identifying the existing circuit and existing switch wiring. Grip these in your non dominant hand while you twist the ends clockwise. Unscrew the wire nut holding the two white wires together. So please open up the wall switch box and see if you have incoming power on one of the romex black from the breaker panel and the white neutral and then you have a second romex that goes up to your ceiling fanlight box.
Using wire strippers peel an inch of insulation from the end of the black and white wires. Ceiling fans help you save money and energy by making rooms more comfortable without. A 20 amp switch costs about 3. Tie the equivalent wires together with wire nutswhile adding a new length of wire long enough to reach the switch you want active. This new wire is called a pigtail. Connect the black fan cable together with the black light wire and the black switch wire and cover them.
Twist the ground wires together and connect them to the green ground screw on the switch. Now when you turn on your light switch the fan will have power. A standard 15 amp switch costs about 75 cents. Locate the switch cable which must be glued through the top or side of the box that serves the fan or the light. If you already have lights and a fan on two switches simply label the wires off each switch remove them from the switches and remove the light switches. And check the same at the ceiling fan fixture wiring box.
Splice the white wires together and cap them. Twist the wire nut onto the three wires to secure them. Thats how you wire a ceiling fan with light to one switch. Connect a light and a fan to a new switch. Mount the fan and light and move to the switch box. Align the stripped straightened ends of black cables from the existing light and switch with the new cable from the fan.
Unscrew the wire nut holding the two black wires together on your existing light. Connect the black wire from the fan to the bottom terminal of the switch and the live circuit wire to the top terminal. To turn the fan and lights off separately use the pull chains on the fan. Get a new 20 amp switch. More energy and money saving ideas.