Wiring a lightbar to high beams

Almboss · May 5, 2017

I have been thinking about how i can wire my light bar to my high beams and just do away with the stand alone switch that it came with. Is doing a piggy back fuse the only way to go about it? Could this cause any problems with drawing to many amps though the high beam circ?

smcgillis10 · May 5, 2017

I have been thinking about how i can wire my light bar to my high beams and just do away with the stand alone switch that it came with. Is doing a piggy back fuse the only way to go about it? Could this cause any problems with drawing to many amps though the high beam circ?

Use a relay and have the high beam wire trigger the relay. No drain on your high beams that way.

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Almboss · May 5, 2017

It has a relay on it already, was planning on leaving it intact.

SilveradoSaver · May 5, 2017

I don't have a light bar, but I have 4 Rigid Industries D-Series pod lights behind my grill. They are wired to come on with my high beams and never had an issue. I had them installed at a truck outfitter though, so not sure how they did them, sorry.

Almboss · September 30, 2017

Well I tried to wire them via the BCM harness under the dash, put a diode on the harness and ran a wire over to the switch i have for the light bar but nothing i did would make the light bar power up. Any thoughts? switched the the diode around and it was on #18 on the brown/tan harness under the dash.

oburgtiger · September 30, 2017

I have a 3-way switch on mine. In all cases, the accessory power must be on. When the rocker is in the up position, the light bar is on. When it's in the middle position, off. The bottom position is tied to the high beams. I tapped the high beam wire by the radiator to trigger 1 relay. The top position of the switch triggers a second relay.

Spurshot · October 1, 2017

I have a 3-way switch on mine. In all cases, the accessory power must be on. When the rocker is in the up position, the light bar is on. When it's in the middle position, off. The bottom position is tied to the high beams. I tapped the high beam wire by the radiator to trigger 1 relay. The top position of the switch triggers a second relay.

Nice setup.

I spliced into the high beam wire near the left headlight to trigger a relay to run my 4 Baja Designs S2 lights. I also have my fog light circuit diode mod to allow fogs on with high beams and replaced my fogs with Rigid SAE/DOT fog lights.

silveradosid · October 1, 2017

are baja s2 flood or spot i have 2 of the sr-m pro series spot lights in the grill amazing how much light these two little lights project

Spurshot · October 1, 2017

are baja s2 flood or spot i have 2 of the sr-m pro series spot lights in the grill amazing how much light these two little lights project

I have one pair of wide beam and one pair of long range spots. They can be bought in at least those two configurations. Might be an intermediate flood. I dunno for sure.

JDuncan · October 4, 2017

I have a 3-way switch on mine. In all cases, the accessory power must be on. When the rocker is in the up position, the light bar is on. When it's in the middle position, off. The bottom position is tied to the high beams. I tapped the high beam wire by the radiator to trigger 1 relay. The top position of the switch triggers a second relay.

This is a slick idea I wish I'd thought of.

I tapped the high beam in my Sierra off the shutter trigger on the headlight harness, then ran to a lit "arming" switch in the overhead console.

Position 1 - on w/ high beams (switch light on when light bar on)

Position 2 - off

BTW, with a few diodes wired up at the switch, you could get multi-mode function w/ one relay.

Crstfr · October 5, 2017

man great ideas... i like the high beam option.... .. i just did mine to the home link button... .. which is fine , i only use the led at the ranch.. ..my HID/led fogs are bright enough.. i rarely go into high beams.

Michael71009 · October 30, 2017

What diodes are you all using? I just installed a 30" bar behind the grill on my 14 sierra. For now I just have it wired up through a wireless switch. The wireless switch just triggers the relay. I would like to have the bar come on with high beams or independently with the wireless switch.
Same with my reverse pods. Currently set up on channel 2 output of my wireless switch but would like for them to multi function as well.

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DenaliDad · January 11, 2020

2015 Denali HD. Already have a 2 way switch wired directly to the battery but would like to swap out to a 3 way so they can run with the high beams if in position 3. Anybody have success going under the steering column to tap into the BCM wire? This GMC only has 1 bulb for all. I see above someone tried #18 w/o success

xr4ticrew · January 27, 2020

On 1/11/2020 at 10:39 AM, DenaliDad said:

2015 Denali HD. Already have a 2 way switch wired directly to the battery but would like to swap out to a 3 way so they can run with the high beams if in position 3. Anybody have success going under the steering column to tap into the BCM wire? This GMC only has 1 bulb for all. I see above someone tried #18 w/o success

Any luck with this idea? I'm trying to do the same thing.

Edited January 27, 2020 by xr4ticrew
typo

DenaliDad · January 27, 2020

25 minutes ago, xr4ticrew said:

Any luck with this idea? I'm trying to do the same thing.

Yes actually. Since I already had it wired directly to a one way switch I simply ordered a new three way switch and ran a wire from the hi beam headlight fuse under the hood. This way position one is always on, 2 is off and 3 is triggered by the high beams. Simple and didn’t have to decipher the bcm harness. There was another thread in here in regards to this hi beam fuse. It’s just labeled headlight fuse but it is only energized with the high beams.