Hey there. I’ve got an 04 Tahoe that I just replaced my DRLs on. Changed them to an amber colored LED and I really like the look. They look great during the day but even better at night, so I was wondering if there’s a way to have the DRLs running at all times. Both during the day as normal, and also still running when the headlights come on.
Anyone know how to make that happen or have ideas?
Thanks!
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This has been discussed at length on this forum, usually because people want all four headlights on with high beams (4 hi mod) or with low beams and fog light on with high beams (6 hi mod). you can search for those terms to see the different methods people have used. Most put diodes in the underhood fuse box to cause the high beam relay activation terminal to also activate the other lights that they want to be on with high beams. There is also a commercial solution called Fleece, which is a plate that you put in your fuse box and then plug the relays in on top of it. Here is one place that you can get it:
https://www.thoroughbreddiesel.com/gm-alo-37/
My preferred method was to do it at the BCM. I wanted the DRLs to stay on with the headlights, and for the low beams and fogs to be on with the high beams. I guess you could call this the 8 hi mod. So I built a small module about the size of a quarter that has four diodes in it with four wires coming out and connected it to the light relay control pins on the C2 connector of the BCM. This way the fuse box isn't cluttered up with the diodes. These are the connector positions for the light relays on the BCM. I didn't use the park lamp control, as that wasn't needed for my set up, I only highlight it to show all of the lighting control relays.
By putting a diode between the two relay controls that you want to work together, you can get the effect that you want. If you want those two lights to always be on together you can just use a wire jumper and not use a diode. The diode lets one of the lights be on by itself, but turns them both on if the first one is on. Most diodes have a silver ring painted around one end like this.
The ring end connects to the light that you want to use to turn on the other light, and the other lead is connected to the light that you want to turn on. The diode only allows electricity to flow one way, so the light connected to the silver end won't be turned on by the light connected to the other end. If you're not getting the result that you want, you probably have the diode connected backwards.
Hope this all made sense and as I said this is discussed elsewhere in this forum too.
