For a single-pole installation:
1. Connect the 2 white wires together (one from the source and the other to/from the light fixture) - 2 wires
2. Connect the black wire from the source to the black wire on the dimmer switch - 2 wires
3. Connect the black wire to/from the light fixture to the red wire on the dimmer switch - 2 wires
4. Connect the ground wires - 3 wires
SOURCE: I am replacing a two
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.
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In a single-pole installation, my instructions say to connect the black wire to hot (so to the black wire), the red wire to load (THIS IS WHERE I AM CONFUSED, not unless it is implying that I need to use 12-3 cable), white to white (source cable to fixture cable which bypasses the dimmer), green to green (ground), and the yellow wire is used for 3-way installations only. Is there a way to connect this dimmer?
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