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.
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:
![Relay.jpg](http://i678.photobucket.com/albums/vv148/IVIarSHMaLLoW/Relay.jpg)
GMT-900 Wiring Diagrams (courtesy of BlkSlvrdo129)
Silverado Front:
![5599514952_140c22788f_b.jpg](http://farm6.staticflickr.com/5305/5599514952_140c22788f_b.jpg)
Sierra Front:
![5599515206_8912d00e94_b.jpg](http://farm6.staticflickr.com/5061/5599515206_8912d00e94_b.jpg)
Silverado Rear:
![6272627015_4693ba7f44_b.jpg](http://farm7.staticflickr.com/6213/6272627015_4693ba7f44_b.jpg)
Scottyboy added: T10-based bulbs will fit just fine in the 194 sockets as well.
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