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jered6323

Simple Secondary Cargo Light Switch

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Posted (edited)

Well, relatively simple at least.

I was tired of having to go into the truck to turn the cargo lights on and off, so I wanted to add a secondary switch in the bed. I searched and found multiple results about adding a secondary set of lights, which was not what I was looking for, so here's my solution.

I wanted to add a secondary switch to turn on/off the factory cargo lights, and retain the 10 minute auto-shut off. Through some searching I found that the switch in the truck works by pulsing a momentary ground to a pin on the BCM, which is pretty easy to replicate/extend.

 

Materials:

Wire. I used some red/black 2-wire, I'll explain why later.

A small scrap of solid core wire.

2 waterproof push button momentary switches.

 

Here's what I did:

 

Soldered a small scrap of solid core wire to both leads to the red/black 2-wire. This made it easier to tap into the BCM.

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Tapped into pin 18 of the blue plug on the BCM. There's a solid gray wire on that pin.

IMG_7159.thumb.jpeg.2d77e4a6b4370228ddb7a417d8c2da09.jpeg

 

Ran the wire out of the cabin (using this method:)

and then down the underside, following a large bundle of wires and using some wire clips that GM/Chevy was nice enough to leave available for use.

IMG_7162.thumb.jpeg.9ad460b2c8b71cbd1ffe3134ad2a5992.jpeg

 

Popped out one of the cargo tie down plugs, and ran the wires through. Here's why I used the red/black 2-wire - measure enough wire out to go back through the hole and then under the bed to the other side, then cut. Now we have enough wire to install a switch on both sides of the bed.

IMG_7151.thumb.jpeg.bde4d5e36098895a853ae18d8feecf94.jpeg

 

Drilled the plug to fit the push button momentary switch, and installed the switch in the plug.

IMG_7153.thumb.jpeg.9a1d8de914719fc4c0bc5e63da68e71a.jpegIMG_7154.thumb.jpeg.15b79e137f88f4d0618de12cadf31a41.jpeg

 

Cut ONLY ONE of the wires at the drivers side hole, and wire it to one lead of the switch.

IMG_7152.thumb.jpeg.119f6c3a461b80c18323fc488362224b.jpegIMG_7155.thumb.jpeg.238e416d0722bbb287c3c833eb0372ee.jpeg

 

Connect the scrap of wire you just cut off (red in this case) to the other lead of the switch. Run both the red scrap and the black wire back through the hole, and reinstall the plug.

IMG_7156.thumb.jpeg.fd68d8ef9cfbc5e80aaff3515454883f.jpeg

 

I didn't take any pictures of this part unfortunately, but run the red scrap of wire to any grounding point and secure.

Then run the black wire to a cargo tie down plug on the other side and repeat the steps to wire and ground it.

 

Then enjoy your 2 new readily accessible cargo light switches!

IMG_7160.thumb.jpeg.4a0103f08bbcb7aac0e2d61ecc30ca05.jpegIMG_7161.thumb.jpeg.49791e94f305486b4827aecfe87c5823.jpeg

 

This activates the same as the cargo light switch in the truck, so any modifications you've made like the reverse lights on with the cargo lights will work just the same as if you pressed  the switch in the truck, and retain the 10 minute auto shut off.

 

Any comments/questions/clarifications please let me know and I'll do my best to get back to you!

Edited by jered6323
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Genius


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way to go, that is how it should have been from the factory.

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Awesome mod!! I’m gonna be doing this for hunting season when my gear is under by tonneau cover and getting ready in the dark is hard.


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Now it’s time to add some lights inside the bed so they all come on together. 

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GOOD IDEAL - my truck came with bed light's , plus I add a 36" led strip across the front for more light . Just need to installed a rear switch.

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Def a cool mod! But I still like the cargo/reverse diode mod better. It's way easier, plus you can use your key fob as a switch.

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Okay pardon me for having a brain fart but what if I only want 1 switch on the driver side?  I guess I just don't understand tying the black and red together with 1 lead where it goes into the BCM.

 

Also any info on the switch you used?

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10 hours ago, xMEATxHAMMERx said:

Def a cool mod! But I still like the cargo/reverse diode mod better. It's way easier, plus you can use your key fob as a switch.

Key fob works great for me, but the lights don’t stay on for 10 mins like it would with his method. 

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Key fob works great for me, but the lights don’t stay on for 10 mins like it would with his method. 
Yeah, I just keep hitting the key fob as needed to keep it on. You can increase the duration the lights stay on, in the radio.

And as always... Enjoy your ride!

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On 3/11/2019 at 3:28 PM, sk said:

Okay pardon me for having a brain fart but what if I only want 1 switch on the driver side?  I guess I just don't understand tying the black and red together with 1 lead where it goes into the BCM.

 

Also any info on the switch you used?

If you just wanted to do one switch, you could just use a single wire run from the BCM back to the switch instead.

 

Switch: https://www.amazon.com/dp/B075N18PXT/ref=cm_sw_r_tw_dp_U_x_NuJICb908RQZ5

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