I have tried to install the Single Pole Leviton # 6631 Dimmer switch. The old switch had the black connected with no Ground. When I install the dimmer using only the Black and also with the Ground the Lights don't dim for the Dining room light and the switch makes a high noise. When I try the same dimmer switch on a "pair" of lights, one will kinda of dim but not the other. They are single pole and not a 3-way. What could the problem be as I have tried it in three places with the same result. I added 4 dimmers in bedrooms 3 months ago with no problem.

red never connects to black as that is power to neutral if wired correctly
get in a qualified electrician to check the wiring and help you install the unit

Hook one of the wires that was connected to the black wire to the silver screw, one to the brass screw. Does not matter which. If there is no ground (bare or green) then you can hook one from the green screw on the switch to the box where the other grounds are connected.

This is single-pole -or- 3-way dimmer
Manual shows on following link:
http://www.lutron.com/TechnicalDocumentLibrary/0301107A.pdf

1) Manual says: The red/white wire is not used in a single-pole application. Twist a wire
nut over this wire for a single-pole application.
2) Green wire connects to bare ground wire. Or bare ground to bare ground.
3) Connect dimmer-red and dimmer-black to either insulated wire that came off of old switch

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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.

One black is will hook up to one of the black wires inside the switch box in the wall and the other will hook to the other black wire in the box, The green will connect to the bare copper wire which is the ground wire.

This is a 3-way switch, made to control a light fixture that is also controlled by another switch in a different location. A typical example is a ceiling light fixture installed in an upstairs hallway, which could be controlled by switches at both top and bottom of the staircase.

The green wire in your switch is the ground connection, and joins to the green insulated or bare copper ground wire in the switch box. The red wire is the common connection. It connects either to the incoming AC hot wire from the electric panel, or to the hot terminal of the light fixture, depending on the switch location. The two black wires are traveller connections. They connect to the traveller terminals of the other 3-way switch.

If you purchased this switch as a replacement for a regular single-pole toggle switch or dimmer switch - one that controls a light from a single location only - then this isn't what you need and you can't use it. You'll know if you have a single-pole switch because it will have only three wires or screw connections. Return it and get a single-pole.

To install this as a replacement for a 3-way toggle switch or dimmer, connect the red wire to the wire going to the common terminal of the original switch. This will be a black- or brass-colored screw on a toggle switch, or the different-colored (not green, that's ground) wire on a dimmer. The black wires connect to the wires that go to the traveller screws (copper-colored) on a toggle switch, or the same-colored wires on a dimmer. It doesn't matter which traveller wire connects to which.

Note that if you're using a 3-way dimmer, only one of the switches can be a dimmer. The other switch has to be a plain old 3-way toggle.

Yes, this is a single pole dimmer switch. Connect the green wire to the ground wire in your electrical switch box and connect one black wire to the power (common wire) in the switch box and the other to the wire going to the incandesant light fixture. (Standard dimmers cannot be used with CFL type bulbs).

You should be working fine! Remember to turn off the power to the wiring your connecting this dimmer to to prevent both getting a shock and from damaging the dimmer during installation.

Hope you found this very helpful and best regards!

the light on the switch does not men it is wired correctly, it only means that you have supplied power at that point. Without knowing more its hard to say, but I'll assume this is a single switch operating a single unit. That being the case, and depending on your fixture, occassionally wires must be grouped together on the switch side. Also quite often these switches are simply defective, and must be returned. If you think you have it correct then its probably a bad switch.

House wires are for a 3 way switch, you will need a different switch