Cargo Lights on with Reverse Lights

[JONES424]

24 minutes ago, daneal said:

I  had an issue with getting this to work. I bought the 1N4004 diodes (chinese got a 25 pack for like $1.25). I put them into the pins that people above mentioned but it did not do anything. i have them in as far down as possible on both sides. Is there something that i probably missed? Or maybe just one bad diode? i have not tried any others yet

the diodes are directional make sure you are testing both ways to see if you have it installed the opposite way. also making sure even though you placed it into the sockets its getting metal to metal contact!

[Ravenkeeper]

 

50 minutes ago, Hswerdloff said:

Alright so I’ve been really wanting to do the cargo light - reverse light mod but i can’t find the right wires in the BCM. I can’t tell if the original post is for a NNNBS, but I have a NNBS. 2011 Silverado 1500 Z71 if that makes a difference. I’ve searched all over google and can’t find a diagram. Here’s a picture of what my BCM wires look like. The site won’t let me load more than one pic. Any ideas? 

BRN26 to PNK26 (there are 27 on PNK), on the 2014s and newer, this forum.  You will need to find a wiring diagram or check with other 2011 owners.  PGamboa may have a diagram for yours already.  I downloaded and scoured the PDF for 2011 electrical build, could not find the information for jumpering your cargo lights and reverse lights.

 

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=14&cad=rja&uact=8&ved=0ahUKEwiU44ezpbLXAhXC8CYKHduDAqIQFghGMA0&url=https%3A%2F%2Fwww.gmupfitter.com%2Fpublicat%2F2011_BB%2FREV_2011_FS_PU_LD_Electric_1210.pdf&usg=AOvVaw1b-jd-jhJ9IpBEpYNvt2Mz

Edited November 9, 2017 by Ravenkeeper

[Neallynein]

Just now, JONES424 said:

the diodes are directional make sure you are testing both ways to see if you have it installed the opposite way. also making sure even though you placed it into the sockets its getting metal to metal contact!

That was what i was going to check next, i think it is the right way just not touching one side. just wanted to see if there was another thing i missed. first time using a diode 

[Ravenkeeper]

28 minutes ago, daneal said:

I  had an issue with getting this to work. I bought the 1N4004 diodes (chinese got a 25 pack for like $1.25). I put them into the pins that people above mentioned but it did not do anything. i have them in as far down as possible on both sides. Is there something that i probably missed? Or maybe just one bad diode? i have not tried any others yet

 

3 minutes ago, JONES424 said:

the diodes are directional make sure you are testing both ways to see if you have it installed the opposite way. also making sure even though you placed it into the sockets its getting metal to metal contact!

 

2 minutes ago, daneal said:

That was what i was going to check next, i think it is the right way just not touching one side. just wanted to see if there was another thing i missed. first time using a diode 

Daneal,  I attached a picture of my Reverse/Cargo connection.  Make sure to also push them in at least 1/4"-1/2".  If you did have the diode backwards, then your reverse lights will come on with the cargo switch.  Also, if you are only going cargos on with reverse, your cargo light switch will also light up in reverse.  Freaked my son out one night, and for a short second, me.  I used the smallest phillips tip jewelers screwdriver I have to create a passage for the wire on the diode down along side the pins/wires I was inserting the diode into.  Pushing the diode wire in can be a little bit of a PITA, without creating a "tunnel."

[Hswerdloff]

1 hour ago, JONES424 said:

I do not have an answer for you but what happened to your wires? 

No idea. This is my first time looking at them and i found them like that

[gmdog2]

5 hours ago, Hswerdloff said:

No idea. This is my first time looking at them and i found them like that

Def some repair work..that will be a little bit of a job..

[Hswerdloff]

13 minutes ago, gmdog2 said:

Def some repair work..that will be a little bit of a job..

I don’t think I’ll be messing with it, I guess it’s been like that for a while cause everything still works as it always has. 

[gmdog2]

True..could always put a little liquid tape on the open ones at least that would close it up..just a thought..

[STKR]

On 9/18/2017 at 10:40 PM, Lamby66 said:

Has anyone doing this mod, or a version of it, find the location where the towing mirror cargo leds are tied into the rest of the cargo light circuit?

 

The upfitters guide says J302 under the left instrument cluster... That is not really too helpful as there is a mile of bundled wire under there....

 

I REALLY want to switch the use of these leds with a SPDT so they are Normal/Off/Reverse. I have a more complex but more useful control of my cargo lights operated by my backup lights and a latching timer circuit but that is only for my bed cargo lamps, as I cant find where I can turn off those annoying mirror LEDS separate from the high mount cargo light (which I would also like on with my circuit)

 

Anyone able to help?

I know this may be a few months late, but I found a link to the GM Upfitter site, and it has every wiriring diagram, and explanations that you could probably want. I have a 2016 2500HD LTZ, so all of my page references are for my wiring diagrams, but they should get you close. 

 

PG & Description:

46 - Center Mount High Stop Lamp (CMHSL)

- - - Fed from X61A jct box, X3 connector, slot 7. 

49 - DQS Cargo Lamps

- - - J302 is the harness connector that goes from the X61A jct box, and splits to the left/right door jamb connectors (X500 & X600). The mirror cargo lamps are fed from X61A, connector X1, slot 17 (WH/VT wire). 

- - - Those two pages should give you options. If you follow the WH/VT wire back from the door jambs, you should be able to find a tie in point to isolate the mirror cargo lamps from the high mount. The diodes, relays, and wiring are up to you. LOL

 

292 - Power and Signal Distribution (beginning)

307 - Passenger Compartment Left Harness

405 - Master Component Locations

864 - BCM, X1 connector, goes through...

(X1, X2, X3, X4, X5, X6, and X7)

877 - BCM, X7 connector. 

 

GM Upfitter:

https://www.gmupfitter.com/pdflists/view/36

 

The 1500/2500/3500 trucks are under the Light Duty section. Drill down to the Electrical PDF (see attached image). You can download the entire PDF, but it’s around 85MB, so be prepared. 

 

Hope this helps,

Jim

 

Edited December 5, 2017 by STKR
Added BCM page references

[Lamby66]

Thank you STKR, but I looked all over and tried to even use a "fox and hound" but I cant find that J302 that I need to access. I think my next best bet would be to go to the dealer and see if the service writers might have a clue. They sure pack stuff tight in these modern trucks ;-)

[minelson33]

Great mod, $2 and 15 minutes.  Thanks for sharing!

[pgamboa]

Thank you STKR, but I looked all over and tried to even use a "fox and hound" but I cant find that J302 that I need to access. I think my next best bet would be to go to the dealer and see if the service writers might have a clue. They sure pack stuff tight in these modern trucks ;-)

Anything with a “J” and some #s will mean a jumper and/or splice off of a main harness. So it may be easily visible. I found this out on a ground distribution I was looking for. Upfitter called out a Jxxx and found that to be a ground splice that was wrapped in a harness. Had to unwrap it to see it.


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[nmyron]

I just have to say thanks to the OP and the rest. Just did this on my 2017. Used a piece of single-strand 24ga hookup I had laying around. 

 

I got a nice set of LED backup and cargo replacement bulbs from eBay (link will be below), right after I picked the truck up because (esp in the rain) at night my backup camera was useless. They helped, some. I hit the seller up (had one of the plate lights go out) and asked about some brighter reverse lamps, and for an extra cost he shipped me a pair to try. Much better, and then when combined with the cargo lamp hack found here, it's almost as bright behind the truck in reverse as in front!

 

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F182525013600

 

This link is for the original reverse lamps and cargo bulbs. I am asking the seller for an updated listing for the new reverse lamps and cargo bulbs. Will update when/if provided.

 

 

Here is a pic of the original upgrade reverse lamps to compare.

Edited January 18, 2018 by nmyron

[E-rich1210]

I know it's been a while since anyone posted on this topic, but does anyone know what the part # would be for the bed light harness, not the led lights just the harness, for a 2018 Silverado 1500 crew cab? Or even better would be if anyone knew what the part # is for the plug under the truck so I can wire in my own lights. Any help is greatly appreciated!

[Ravenkeeper]

8 hours ago, E-rich1210 said:

I know it's been a while since anyone posted on this topic, but does anyone know what the part # would be for the bed light harness, not the led lights just the harness, for a 2018 Silverado 1500 crew cab? Or even better would be if anyone knew what the part # is for the plug under the truck so I can wire in my own lights. Any help is greatly appreciated!

The part number(s) that you are looking for are listed in one of these, think it was in the LONG one, "LED Under Rail Bed Lighting."