Why Choose This Extension For Glass is Class Gen 2?
Some Gen 2 watermelon light installs need more than a short jumper. The DD4099 3m DT 4-pin extension wire gives you the extra reach needed for longer plug-and-play wiring routes without cutting, splicing, or building a custom extension.
This is the better choice for larger custom layouts, rear-facing light placement, longer bracket runs, pickup installs, semi-truck installs, or any Glass is Class Gen 2 setup where a 1m extension is not enough.
Key Features & Benefits
Adds 3 Meters Of Plug-And-Play Wiring Reach
The DD4099 adds 3 meters of DT 4-pin extension length. This gives you more room to route wiring around the cab, frame, bumper, grille, mirror area, or other custom mounting locations.
Ideal For Longer Gen 2 Lighting Layouts
Glass is Class Gen 2 lights now use a 4-pin DT connector, and this extension helps keep that plug-and-play system intact across longer runs. It is useful when adding lights beyond the immediate reach of the DD4104 relay harness or DD4100 splitter.
Male-To-Female DT 4-Pin Extension
The DD4099 uses one male DT 4-pin connector and one female DT 4-pin connector. It installs inline between compatible DT 4-pin Gen 2 lights, splitters, and harness outputs.
Heavy-Duty 14AWG Wire
The DD4099 uses 14AWG wire for a stronger wiring accessory than a basic universal extension. This makes it a better match for clean lighting layouts where durability and serviceability matter.
Over-Molded Connector Design
The over-molded DT connector design helps provide strain relief and protection from the elements around the connector body. This supports a cleaner install and helps avoid exposed splice points.
Performance / Compatibility / Use Case
The DD4099 is best used when a compatible Glass is Class Gen 2 DT 4-pin light needs to be placed farther from the harness or splitter. It pairs well with the BTS universal Gen 2 kit, the DD4104 relay switched harness, the DD4100 splitter, and additional Gen 2 watermelon lights.
Use cases include:
- Longer wire routing for custom semi-truck lighting layouts
- Rear or side lighting runs
- Larger pickup or big rig installs
- Routing from a relay harness to a distant bracket location
- Keeping a Gen 2 install plug-and-play without cutting or splicing
This extension does not increase harness capacity. It only adds wire length. Make sure the full lighting system stays within the safe current limits of the harness, fuse, wiring, and switch setup.
Installation / Fitment / Technical Details
This extension is designed for compatible DT 4-pin wiring layouts. For Glass is Class Gen 2 installs, confirm that your lights and harness use matching DT 4-pin connectors before ordering.
Technical details:
- Product type: DT 4-pin extension wire
- SKU: DD4099
- Length: 3 meters
- Connector layout: 1 male DT connector and 1 female DT connector
- Wire size: 14AWG
- Connector type: DT 4-pin
- Operating voltage listed by Diode Dynamics: 9–16V
- Operating temperature listed by Diode Dynamics: -40C to 85C
- Installation time listed by Diode Dynamics: 5–10 minutes
- Tools listed by Diode Dynamics: None
- Modification listed by Diode Dynamics: None
- Listed shipped weight: 1 lb
Important voltage note: Diode Dynamics lists this extension at 9–16V. For 24V Glass is Class Gen 2 builds, confirm the full harness and wiring setup before installing.
Build Quality / Materials / Warranty / Trust Signals
Diode Dynamics lists this extension with heavy-duty 14AWG wire, standard DT 4-pin connectors, over-molded connector bodies, and a 3-year replacement limited warranty.
For BTS customers, the DD4099 helps turn Glass is Class Gen 2 into a cleaner expandable lighting system. It gives customers more room to route wiring properly while keeping the install modular and easier to service.
What’s Included
- 1x Diode Dynamics DD4099 DT 4-Pin Extension Wire, 3m
Frequently Asked Questions
Does the DD4099 work with Glass is Class Gen 2 watermelon lights?
Yes, it is intended for compatible DT 4-pin Glass is Class Gen 2 wiring setups. Confirm your lights, harness, and splitter use matching DT 4-pin connectors before ordering.
What is the DD4099 used for?
The DD4099 adds 3 meters of extension length between compatible DT 4-pin wiring connections. It is useful when a Gen 2 light needs to be mounted farther from the harness or splitter.
Is this better than the DD4098?
The DD4099 is better when you need a longer wire run. The DD4098 is the shorter 1m option, while the DD4099 gives you 3m of added reach.
Does this require cutting or splicing?
No cutting or splicing is required when used with compatible DT 4-pin Gen 2 connectors. It is designed as an inline plug-and-play extension.
Can this be used with the DD4100 splitter?
Yes, it can be used with compatible DT 4-pin splitter and harness layouts. Many customers may use the DD4100 splitter to add another Gen 2 light, then use DD4098 or DD4099 extensions to place the light where they want it.
Can I run unlimited lights with extensions and splitters?
No. Extensions and splitters do not increase harness capacity. Always confirm current draw and harness limits before adding more lights.
Will this work with older Glass is Class watermelon lights?
Older hardwired Glass is Class lights may not use the same DT 4-pin connector. This extension is intended for compatible Gen 2 DT 4-pin setups.
Can I use this on a 24V truck?
Do not assume this extension is 24V compatible. Diode Dynamics lists this extension at 9–16V, so 24V builds should be confirmed before installation.
