Important!: LED Bulb Replacement Guide

[Khaos]

I was asked by our fearless leader :jared: to make a thread to help with questions about swaping your current lights to LED lights.

These bulb types are the stock incandescent bulbs from the factory. Use these numbers to look up the correct replacement LED bulbs for your vehicle.

OBS Trucks (courtesy of Moore)

Quantity Bulb # Description
1 211-2 Rear Dome
1 562 Rear Dome L
1 562 Rear Dome R
1 211-2 Center Dome
1 562 Center Dome L
1 562 Center Dome R
4 37 Vanity Mirror
2 168 Map Reading
1 194 Driver Foot
1 194 Passenger Foot
1 194 Glove Box
1 168 Driver Door
1 168 Passenger Door
1 194 Ash Tray


1999-2002 NBS Trucks

9006 Low beam headlamp
9005 High beam headlamp
4157 Parking light
4157 Front turn signal
3157 Rear turn signal
3157 Tail light
3157 Stop light
912 High mount stop light
880 Fog/Driving light
194 License plate
3157 Back up light
194 Front sidemarker
194 Rear sidemarker
194 Glove box
194 Map light
211-2 42mm Dome light
74 Step/Courtesy light
194 Step/Courtesy light
921 Trunk/Cargo area
4114 Daytime running light


2003-2007 Classic NBS Trucks


9006 Low beam headlamp
9005 High beam headlamp
4157 Parking light
4157 Front turn signal
3157 Rear turn signal
3157 Tail light
3157 Stop light
912 High mount stop light
9005 Fog/Driving light
194 License plate
3157 Back up light
194 Front sidemarker
194 Rear sidemarker
194 Glove box
194 Map light
211-2 42mm Dome light
74 Step/Courtesy light
194 Step/Courtesy light
921 Trunk/Cargo area
4114 Daytime running light


On NBS Trucks, the 912 & 921 bulbs have the same base as the 194 bulbs, so you can use them instead.
The 4114 DRL can be swaped to a 3157 bulb, but it can lead to issues.

2007-Present NNBS Trucks


H11 Low beam headlamp
9005 High beam headlamp
4157 Parking light
4157 Front turn signal
3047 Rear turn signal
3047 Tail light
3047 Stop light
912 High mount stop light
5202 Fog/Driving light
194 License plate
3047 Back up light
194 Front sidemarker
212-2 Map light
212-2 Dome light
921 Trunk/Cargo area
4157 Daytime running light

I don't know anything about the NNBS lighting system, so if anyone wants me to add or change this post up or PM me.

All LED bulbs in your turn signals WILL hyper flash. There are a few fixes for this.

1. Load Resistors. These go in line with the bulbs. If you are doing 2 bulbs, buy 6 OHM 50W Load Resistors. For 4 bulbs, buy 3 OHM 50W Load Resistors. They can be purchased for around $5-$7 per pair. This is your only option if you have a GMT-900 (NNBS) as the BCM controls the flashing.

2. Replace your stock flasher with an aftermarket one made for LED bulbs. I'm not sure which ones are needed, someone can chime in on this. I know VLeds sells a bunch of them.

3. Modify your stock flasher. This is the cheapest option. Take the cover off of your flasher relay. There is a chip in there that you will need to remove the 7th "leg" or pin on it. This will disable hyper flash but you lose the Bulb Out indicator...small price to pay for a free mod.

Pic of the chip:

GMT-900 Wiring Diagrams (courtesy of BlkSlvrdo129)

Silverado Front:

Sierra Front:

Silverado Rear:

Scottyboy added: T10-based bulbs will fit just fine in the 194 sockets as well.

 

[ScottyBoy]

Also, I have used T-10 sized LED bulbs in place of 194 bulbs with no issues.

 

[Khaos]

That's because they share the same base, correct? I was hoping you would chime in if I missed anything.

 

[Moore]

You fuckboy, didn't even include obs :nono:

Quantity Bulb # Description
1 211-2 Rear Dome
1 562 Rear Dome L
1 562 Rear Dome R
1 211-2 Center Dome
1 562 Center Dome L
1 562 Center Dome R
4 37 Vanity Mirror
2 168 Map Reading
1 194 Driver Foot
1 194 Passenger Foot
1 194 Glove Box
1 168 Driver Door
1 168 Passenger Door
1 194 Ash Tray

 

[Khaos]

:rofl: so sorry dude, didn't even cross my mind. will update it now

 

[Jared]

lol malik


making this a sticky

 

[Khaos]

Thanks man. Hopefully should help some people look up bulbs.

 

[BlkSlvrdo129]

Here's some diagrams for GMT900 wiring harnesses:

Silverado Front:

Sierra Front:

Silverado Rear:

 

[Khaos]

I was also waiting for you to reply. I always see ya posting up in the "light mod" thread on gmfs and helping out. Thanks man, updating 1st post now :shake:

 

[j.mo]

So, if I pull the leg/pin on the relay and disable bulb out ind, do I still need resistors?

Or is it one or the other? Because relay go about seems much better route

 

[Khaos]

No, you wouldn't need resistors if you modified the stock relay. It is the cheapest route to go, but resistors are easy if someone doesn't want to mess with their stock stuff :shrug:

 

[j.mo]

I really could care less about bulb out indicator. Seems the easiest route.

And if ever wanted to go back to having indicator, could replace relay.

 

[j.mo]

Thanks for the info/write up. :shake:

 

[Ginger]

Question, The relay is under the hood right? int aht fuse box?

 

[Khaos]

Nope, under the driver side kick panel under the steering wheel.

Take the lower dash piece off and you should see a square opening. Look in there and to the left side of the opening you should see a black box type thing. That is the relay. Just pull to the right to get it out and pop the cover off with a butter knife or think screwdriver. Then you can modify the #7 pin on the one transistor.

 

[Ginger]

ok thanks Chris

 

[slicksierra]

Do 99-02 trucks have a glovebox light?


Sent from Buck Tooth Betty

 

[Ginger]

i know my 03 does, i put a led in it.

 

[Khaos]

ok thanks Chris

:shake: no problem

Do 99-02 trucks have a glovebox light?


Sent from Buck Tooth Betty

Yes, they should. IIRC, you have to unscrew the latch where it closes to get to it better. It's a pain to swap. I can check my dad's Yukon later if you need me to.

 

[slicksierra]

Yeah cause I always wondered that, my glove box doesn't light up lol


Sent from Buck Tooth Betty