Low beam doesn't work

Are you sure you checked the correct fuse? "LO HDLP-LT" 10 amp. That is about the only thing that isolates that light.

In the underhood fuse box on the left side on the truck, check these:

LO HDLP LT fuse (10A)
(This fuse will only have power on it when the headlights are turned ON)

** The HDLP LO RELAY controls both headlight when they are on LOW, so if one light works on low this means that the HDLP LO RELAY is working properly.

Recheck for power at the low beam headlight socket on the YELLOW wire (remember to turn the headlights ON).

The BLACK wire on the low beam headlight socket is ground. Check to see if it provides a good ground. (This is how: connect the clip-lead of a testlight to the black terminal of the headlight socket [be careful not to damage the terminal] and touch the pick end [sharp end] to the POS battery terminal. If the light comes on, then the black has a good ground. If not, recheck your connections and try the "test" again. If it fails a second time, tract the black wire to find where the ground is interrupted.

You can do the same test with an voltmeter, however instead of having a light come on the meter will read battery voltage (usually between 12V - 14V).

Let me know how it turns out.

Do you have power coming out of heqadlight switch? Possible bad headlight switch

Okay so have you checked the dimmer switch? The dimmer is responsible for low beams or no low beams. How it is wired is from the headlight switch to the dimmer switch then to the lights. So if the dimmer switch is bad then you may have one beam and not the other.

Here is a wiring diagram (below) that will help you do some testing to see what the problem is.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Please run some tests and get back to us we are interested to see what it is.

Cheers,

Ok as far as the DRL's I never ASSUME anything as many people figure you should just know what they have with never seeing there vehicle so I have learned just ask. No need to get short with me. As far as the unpluging of it, I am going by what I see and how it looks like it should be I don't work on only one type of car I work on many with many different problems so sometimes I must go by memory or what it looks like it should do. After looking at the switch online I see that it doesn't unplug up there at all. You need to follow the wire harness down the column and you will find two connectors that you unplug so my bad I should have checked this the first time I was just going by what I was seeing in the pics you included. So here is a pic of the switch and the connectors that you are looking for so you can do your test.

Here is the connectors

Hello,

Yes you must remove the steering wheel to change the switch here is some diagrams to help (below) and some guide that might help.

https://www.2carpros.com/articles/air-bag-removal-steering-wheel

and

https://www.2carpros.com/articles/steering-wheel-removal

Please let us know if you need anything else to get the problem fixed.

Cheers, Ken

Nope, that is the way they work. You can buy an aftermarket relay and wiring kit that makes all lights come on when hi-beams are on