I have a black wire a white wire and a ground wire im tring to install a leviton 3 way dimmer it has a red, green,and red,2 black wires what wires go together

Connect the green dimmer wire to your ground wire

The best thing you can do in that situation is match the wire colors of the dimmer to the colors of the screw terminals on the switch you removed. Unfortunately, its too late for that - so here's my best guess: One of the black wires in the box will be coming from the same romex cable as the red wire. Take THAT black box wire and connect it to one of the red wires on the dimmer. Take the red box wire and connect it to the remaining red wire on the dimmer. Connect the black dimmer wire to the remaining black wire in the box. The two white connectors in the box get tied together - they don't get tied to the dimmer. And the ground (green) wire on the dimmer just connects to the bare ground connection in the box itself - or to the metal backbox - or cut it off and don't use it.

Electrician test wiring before connecting anything.
First of all, you don't mention what type of switch was replaced.

1) Leviton 6230 countdown timer is made to replace single-pole light switch only.
Single pole is where 1 switch controls the Load (light fan motor)

Your wiring sounds like 3-way switch.
3-way is where 2 switches control same Load.
For example a hallway usually has 3-way switches.

To confirm. If old switch has 1 dark screw, 2 brass screws, and 1 green screw, then that is 3-way switch. Use Leviton LTB15, LTB30, LTB60, LTB02, LTB12 countdown timer for 3-way.
Smarthome sells product and shows .pdf manual
http://www.smarthome.com/4255/Leviton-LTB60-1LZ-4-Button-10-20-30-60-Minute-Countdown-Timer-Switch/p.aspx


2) If old switch has 2 brass screws and 1 green screw then that is single-pole switch.

3) If you are replacing single-pole switch, here are testing & wiring instructions for Leviton timer.
Remove device and separate wires for testing.
Use ordinary two wire tester.
Tape tester leads to wood sticks so hands are away from power.
Do not untwist wires that were twisted together before you started.
Turn on power.
Test each wire to bare ground wire.
Tester lights up on Hot wire. This wire will connect to timer black wire.
Now you know Hot wire.
Test Hot wire to each of the other wires, excluding bare ground wire.
Tester lights up on neutral. Timer white wire connects to Neutral wire.
If box does not contain Neutral wire, then timer white wire connects to bare ground.

Timer green wire connects to bare ground wire.
Timer red wire connects to wire going to Load.

The red wire is your chase wire and needs to go all the way to the other switch

remove white switch one and connect to incoming white ground--all whites should be connected [hooked] together these are grounds-- switch 1 black from fan ,leave switch 2 red from fan ,switch 3 vanity black

one of the white wires has power on it constantly....that wire connects to the black wire of the leviton.......the other white wire which has no power to it is going to whatever needs power so that wire connects to the red wire of the leviton....the green wire connects to the metal box where your mounting the leviton.

You are correct in assuming green is the ground and connects to bare copper wire. Black is always the HOT wire and should be attached to the black wire. Red wire connects to white wire.

I'm not sure if this is going to work in your case, but I'm pretty sure it will...

Green to ground (probably bare)
Black to black
White to the red that's not labeled 3-way
wire nut on the red labeled 3-way

That should fixya!

house has a black and a white line and a ground commper, dimmer has two black and a green
How do I know which blck lead goes to white and which goes to black? One lead is shorter than the other.

one black from the dimmer to black. the other black from the dimmer connected to red. the green connected to the bare wire.