Switch at Tailgate for Cargo Light

fondupot · July 18, 2014

Nice idea. Should have came from the factory like that.

Edited July 18, 2014 by fondupot

FlBowhunter · July 18, 2014

Now if we can just get someone to make it so you can hit both the lock and unlock on the remote to activate the cargo lights. I will do this mod ASAP. Thank you.

I already tried that found the door unlock signal wire and taped the light signal wire. Used a diode so the signal did not flow both ways otherwise when you hit the cargo light switch the doors would unlock, no luck. I think you can do it with a small relay. I may try this when I have some time down the road.

FlBowhunter · July 18, 2014

Can we get some pics!

Sent from my iPad using Tapatalk

Sorry no pics but the diagram in the attachment should show you how to hook it up and where you put the switch and how you get the wires to the bcm really is your choice. I mounted the switch in the plastic plug because I was able to pop it out and mount the switch and wire it on my work bench. Like I said in my post I prefabbed the entire wire harness in a wire loom and tied it off to an existing harness running up the frame rail on the drivers side. once inside the cab popped out the bcm plug tapped the 2 wires. Done

Crf450r420 · July 19, 2014

Where are you getting your wiring info for the truck from? I'd like to try some ideas, but not going to happen fast if I have to tone everything out.

FlBowhunter · July 19, 2014

gmupfitter website

https://www.gmupfitter.com/files/media/photo/474/2014%20BBM%20Electrical%20section_10_18_2013_WIP.pdf

Smoothbassman · August 19, 2014

Ok, I need this modification immediately. Hate going into the cab to turn on lights. Don't know why there's no switch in the back. Where is the BCM located at? I'm setting this up this weekend.

Crf450r420 · August 20, 2014

Just started looking through the wiring and I don't have anything fully figured out, but I do have some ideas. First, if we tie the horn to the cargo light with a diode it can control the light without the light controlling the horn. Then when you set it up to signal with the horn on a double lock button press it could turn on the cargo light. Another press or maybe double press it would turn it off. You could also use the horn (much easier to reach than that center switch). Since the light will not come on when driving you can still use your horn for idiots without looking like one yourself.

Random thing came to mind also. I have 1998 car that rolls up the windows and closes the sunroof with the alarm lock button, so of course 16 years later my new truck doesn't. How about finding a way to give the courtesy lights control of another power to the windows after the door has been opened. Then if you tie the door lock with the window up signal with a relay only powered with the puddle lights we could roll up windows after exit remotely. Just thought of this because we will not likely add an alarm to these trucks.

Smoothbassman · August 23, 2014

Ok I did the rear brake light modification to get this to work. Hit the fob and the lights come on. Simple and it cost me 5 bucks for a little wire and a couple of diodes.

Crf450r420 · August 24, 2014

Ok I did the rear brake light modification to get this to work. Hit the fob and the lights come on. Simple and it cost me 5 bucks for a little wire and a couple of diodes.

so your cargo lights come on also?

Smoothbassman · August 24, 2014

so your cargo lights come on also?

No.

Just the led lights in the bed.

Put the diode in the circuit prior to the cargo lights.

morrislee · November 26, 2014

I have a canopy, so I end up using the puddle light signal! My lights will be off like normal when key is in run position

PA Hunter · April 9, 2016

How do you get to the back of the switch or remove the switch. Havn't really looked yet but that seems to be the hardest part. Really want to do this in my truck.

Whiterado1473 · November 13, 2016

I tried this mod today but couldn't get it to work. I just tapped into the listed holes on the bcm with short wires to see if it would work before running all the wires. Does it take a special switch? The one I am using has three posts, one power, one load, and a ground. Any suggestions would be great! Thanks in advance!

ctfiveo · November 14, 2016

Ok I did the rear brake light modification to get this to work. Hit the fob and the lights come on. Simple and it cost me 5 bucks for a little wire and a couple of diodes.

Where it the how to for this mod? I'd be more interested in this than running a switch.

Thanks.