Need to know dimmer switch wiring color - 2001 Dodge Ram 2500 Truck

However, this video should help:
Dimmer Switch Replacement

What is year--make--model of vehicle? Right now, I'd say, check the wiring circuit to and from dimmer switch. Could be dimmer switch, itself?

With wiring diagram, you can find proper color wire from steering column to low beam, everything on, see if voltage on that wire. I'm speculating that the dimmer switch controls voltage to low beam and not ground.

Under the dash, find wiring harness that goes into steering column, find proper color wire, test. If no voltage, when there should be, I think the problem is in the steering column, either wiring circuit or dimmer switch.

Hi Jim, what is year--make--model? Usually the headlamp switch and the dimmer switch are two different components. W/o year--make--model, I can't look up wiring colors. I can't tell if wired around the headlamp switch--dimmer switch or what?

alldata.com

Car Radio Constant 12v+ Wire: Red
Car Radio Switched 12v+ Wire: Green/Black
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Yellow
Car Stereo Dimmer Wire: Black/Orange
Car Stereo Antenna Trigger: Green
Left Front Speaker Positive Wire (+): Black
Left Front Speaker Negative Wire (-): White
Right Front Speaker Positive Wire (+): Blue
Right Front Speaker Negative Wire (-): Red
Left Rear Speaker Positive Wire (+): Black
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Green
Right Rear Speaker Negative Wire (-): Orange

All go out at once, first check fuses,then dimmer switch for dash lights, finally headlight switch. To check dimmer switch, pull connection off back, on harness with test light and headlight switch activated, 1 of the leads should have power, if so, use ohm meter on dimmer to make sure it has reading between 0 and some value, if no value, open, dimmer is bad, if there wasn't power then check headlight switch, there should be heavier gauge wire that powers switch and 1 for output to hi/lo switch, smaller gauge wires for tail lamps, dash lights, license plate lamps, parking lights. The color wires from dimmer would correspond to the same colored wires on headlamp switch, probe that connection on headlamp switch with switch engaged and see if you have power, if not replace switch, if so, check wire from switch to dimmer.Now if the lights slowly went from bright one day, to less bright some other day, to not working, then the bulbs are bad... good luck...

The wiring for the low beams would run not to the ignition, but to the dimmer switch. I don't know what color they are, but sounds like you are at the source of the problem, if the low beams quit when the column is let down. Pull the trim pieces off the steering column and examine the wires going to the dimmer switch. You may see some wiring insulation scraped off. It could be a bad dimmer switch, but check the wiring first.
Good luck.

The radio number has nothing to do with the wiring. Here is what the book shows.
2000 Chevrolet S10 Pickup Car Stereo Radio Wiring Diagram
Car Radio Constant 12v+ Wire: Orange
Car Radio Switched 12v+ Wire: Dark Green
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Gray
Car Stereo Dimmer Wire: Violet/White
Left Front Speaker Positive Wire (+): Tan
Left Front Speaker Negative Wire (-): Gray
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Dark Green
Left Rear Speaker Positive Wire (+): Brown
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Dark Blue
Right Rear Speaker Negative Wire (-): Light Blue

go to installer.com

Radio Constant 12V+ Wire: White/Green
Radio Switched 12V+ Wire: White/Red
Radio Ground Wire: Black
Radio Illumination Wire: n/a
Radio Dimmer Wire: Red/Black
Radio Antenna Trigger Wire: n/a
Radio Antenna Location: Rear Glass
Front Speakers Size and Location: 6 1/2′ Doors
Left Front Speaker Wire (+): Blue/Green
Left Front Speaker Wire (-): Gray/Black
Right Front Speaker Wire (+): Red/Green
Right Front Speaker Wire (-): Brown/Black
Rear Speakers Size and Location: 6′ x 9′ Rear Deck
Left Rear Speaker Wire (+): Blue/Yellow
Left Rear Speaker Wire (-): Gray/White
Right Rear Speaker Wire (+): Red/Yellow