LED Halo Headlights wiring

Tiny
KDADICKS84
  • MEMBER
  • 2002 CHEVROLET TRAILBLAZER
  • 4.2L
  • V6
  • 4WD
  • AUTOMATIC
  • 80,000 MILES
Don't know where to wire the Halo lights to use them. There is a red and black wire coming from the light assembly and I'm not sure where to connect them to the headlight wiring harness.
Sunday, April 3rd, 2022 AT 10:41 AM

7 Replies

Tiny
STEVE W.
  • MECHANIC
  • 13,414 POSTS
There won't be any connections in the factory harness to use as those are not a plug and play system. How they connect depends on when you want them to turn on. If you want them to turn on with the marker lights you would add a relay that turns on and off with the marker light, then connect the halo lights to the feed from the relay. So how do you want them to work?
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Sunday, April 3rd, 2022 AT 11:56 AM
Tiny
KDADICKS84
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I want them to be on with the running lights. The halo lights aren't plugged in and play, they're just two wires that are bare on the ends.
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Sunday, April 3rd, 2022 AT 1:43 PM
Tiny
STEVE W.
  • MECHANIC
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Okay, for running lights it will be a bit easier as you only need a single relay. First thing is to look at the directions and be sure that the red wire is positive, and the black is negative, have seen that reversed a few times.
So, if the black wires are ground, the simple solution would be to crimp a ring terminal on each one and simply drill a hole in a grounded body part nearby and use a screw into clean metal. Then spray some paint over it to slow rust down. That leaves the red wires to deal with. For those you can use a crimp and seal butt connector on the one side farthest from the fuse box to attach a longer red wire to go across to the other light. Now to install a relay to control them. Go to the fuse box and find a place to tap constant power from. Run a wire with an inline fuse (look at the amp rating of both lights combined to determine fuse size) down toward the lights. Get a 12-volt relay (common as dirt 4 pin Bosch style will do the job) Now for the wiring. You have the power for the lights from the fuse box. You have the red wire that will power the lights. If you want to test them just touch those wires together and you can see how they will look. Now you need two other wires, one will be the ground for the relay and the other will be the control wire for the relay. For the ground you just need a piece of black wire with a ring terminal on one end that gets attached like you did the other grounds, then mount the relay where you like so that the power and ground leads reach it.

Cut the power lead and crimp on a connector to fit the relay, push that connector onto terminal 87 on the relay.
Cut the ground wire and crimp a connector onto it, then push that onto terminal 85 on the relay.
Next take a piece of the red wire like you used to run the new wire to connect the lights. Connect the two lights and the red wire together and run that red wire up to the relay, add a connector and attach that wire to terminal 30 on the relay.
Now for the last wire, the one that will turn the lights on with the running lights. For this one goes to the front marker light or the side marker light and find the brown wire. That is the power feed for the running lights. Now for the hard part, you need to tap that wire, the easy way is to cut it and use the butt connectors like you did for the red wire, just add a brown wire to one side so that you can run to the relay.
Run that wire up to the relay and add the connector and put it onto terminal 86 on the relay.

OK if you have it wired correctly turning on the marker lights should now turn on the halos.
See the attached for a diagram. Any questions just ask.
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Sunday, April 3rd, 2022 AT 4:29 PM
Tiny
STEVE W.
  • MECHANIC
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Did you have any luck wiring them in or just haven't had the time? Just want to check in.
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Tuesday, April 5th, 2022 AT 5:12 PM
Tiny
KDADICKS84
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I haven’t had time, I work 13-hour days, and have four kids but if I don’t have to work on Friday, I will be doing it first thing and I will let you know.
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Tuesday, April 5th, 2022 AT 6:17 PM
Tiny
STEVE W.
  • MECHANIC
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Oof, that's a tough schedule. If you run into any issues just holler.
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Tuesday, April 5th, 2022 AT 8:30 PM
Tiny
05COLORADO
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Hey Steve-
It sounds like you’re extremely knowledgeable on this topic and I had a question for you:
I bought a pair of led halo projector headlights for my 2005 Chevy Colorado. They look and function great but I’ve run into some issues wiring the led’s. The instruction video says to splice the led into the low beam wiring. If I do that then the led’s will only light up when the headlights are on, not with the drl, parking lamp setting, or highbeams.
I called the manufacturer and they said I could alternatively splice them into the drl’s. The downside here is that the led will only be in with the drl, not when the headlights switch on.
The best answer I’ve gotten is to wire the leds independently to a relay through the fusebox then to a switch I could manually hit from in the cab. This seems like way more money and effort than I was hoping to spend on a cosmetic upgrade. Is there possibly an alternative way of splicing into a continuous power source once the truck is on?
Sorry for the novel but hopefully you enjoy a puzzle. Thanks,
-05Colorado
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Tuesday, November 29th, 2022 AT 2:05 PM

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