The Short Answer
The INEOS Grenadier has a factory DTP port on the roof — a sealed Deutsch connector that supplies switched power from the EXT2 ceiling switch. The DVA LED Roof Light Bar connects directly to this port in its DTP Edition variant, so there's no under-hood wiring. The unit itself is precision-molded ABS that follows the Grenadier's roofline — no drilling, no brackets, no crossbar slot consumed. Output: 4 × 40W LEDs, 160W total, ~7,000 lumens. Forum owners gravitated this direction after noticing the OEM crossbar-mounted light bar creates significant wind noise at highway speeds and eliminates roof rail position flexibility for other accessories.
Why Roof Light Bar Position Matters More Than Brand
The Grenadier's roofline is not complicated, but it has a few constraints that make light bar placement more consequential than it looks at the dealer. The Safari windows — the rear quarter glass that folds outward — require clearance above and in front of the B pillar. Get the crossbar position wrong and you either block the windows or can't open them fully. Meanwhile, the front A-pillar position, which gives the best forward beam angle, is also the windiest crossbar slot on the vehicle.
Most owners ordering through dealers get the light bar pre-mounted at the A-pillar position on the front crossbar. That seems correct for lighting angle — but it's the worst position for road noise. The crossbar and light bar assembly act as a resonating structure at speed. Forum owners reported the combination creating a loud whistle above 50 mph even after adding rubber gap-sealing tape to every joint.
"I had that set up on delivery — however it was really noisy when driving, with the light bar/cross bar making a loud whistle above 50 mph, even having added rubber noise-reducing strips in every gap. So I moved the light bar to the B pillar."
— sean0809, The Grenadier Forum, "Light bar and mounting" thread, June 9, 2024 (theineosforum.com)
Moving to the B pillar solved the noise, but created a new constraint: the light bar now sat behind the front Safari windows, limiting forward throw. And because both crossbar positions were now occupied — one for the light bar, one for a roof rack or ski carrier — owners lost mounting flexibility entirely.
The flush-mount approach solves both problems by removing the light bar from the crossbar system altogether. It mounts directly to the roofline ahead of the A pillar, gives the best possible forward angle, and frees both crossbar positions for cargo, roof boxes, or other accessories mounted on the DualTrack crossbar system.
The Grenadier DTP Port: What It Is and Why It Changes the Install
The INEOS Grenadier ships with a rooftop DTP-06-2S connector — a sealed Deutsch connector near the front roof section that delivers switched 12V power from the vehicle's electrical system. The EXT2 switch on the ceiling panel controls it. This is the same port used for Starlink Mini mounts, auxiliary lighting, and rooftop accessories that need switched power without running a separate wire through the headliner.
For lighting specifically, the DTP port means: no running wire to the fuse box, no drilling through the A pillar, and no switch panel wiring. The DVA LED Roof Light Bar DTP Edition includes an adapter cable that connects directly. Flip EXT2 on the ceiling — lights on. Flip it off — lights off. The whole install is reversible with no permanent modification to the vehicle.
The rooftop DTP-06-2S port is standard on the INEOS Grenadier from the 2022 model year onward on most markets. Verify your roof has the port before ordering the DTP Edition — open the sunvisor area near the front roof and look for the sealed two-pin Deutsch connector. If it's absent, use the FOB Edition instead (under-hood DC connection with Bluetooth key fob).
DVA Flush-Mount LED Roof Light Bar
The DVA LED Roof Light Bar was designed specifically for the Grenadier's roofline — the ABS housing is precision-molded to follow the factory roof contour, mounting with high-strength automotive tape and no drilling. The result is a unit that looks integrated rather than bolted on, while delivering 160W of wide-beam flood lighting for trails, recovery, and camp setup.
Each unit houses four 40W LED pods inside a sealed ABS composite housing. ABS resists UV degradation and impact better than polycarbonate at comparable weight, which matters on a vehicle that's genuinely used off-road. The beam pattern is tuned for wide-angle flood coverage — useful for camp lighting and recovery — rather than the long-distance spot throw you'd use for high-speed highway driving. Aerodynamic housing profile means minimal wind noise, verified by the DVA forum thread owners who specifically noted the lack of whistle compared to crossbar-mounted setups.
Two Variants: DTP Edition vs FOB Edition
The light bar comes in two electrically-identical options that differ only in power source and switching method:
- DTP Edition — connects to the factory rooftop DTP-06-2S port using the included adapter cable. Activates via the EXT2 switch on the ceiling panel. Best for Grenadiers with the rooftop DTP port. Native integration, no extra switch hardware.
- FOB Edition — wires directly to under-hood DC power. Activates via included Bluetooth key fob. Universal fit for any Grenadier, including those without a rooftop DTP port.
Both variants retail at the same price and use identical LED hardware. The DTP Edition is the cleaner install if your vehicle has the port. The FOB Edition suits Grenadiers where the DTP port is absent or already in use by another accessory.
Side Flood Lights: Adding Camp Lighting Without a Second Bar
The roof light bar handles forward illumination. For camp setup — lighting the area beside the vehicle for cooking, gear deployment, or recovery work — the better solution is dedicated side flood lights that mount to the DualTrack crossbar and angle downward.
The DVA LED Side Flood Light mounts to the roof rail system and plugs directly into the DTP port via its own adapter cable. The beam aims downward and outward, illuminating the flanks of the vehicle without blinding anyone standing near it. A 2-pack covers both sides simultaneously. Combined with the roof light bar, you get 360-degree coverage for night operations — forward trail illumination and side camp lighting from a single wiring run at the rooftop DTP port.
Install Overview: DVA Roof Light Bar (DTP Edition)
Installation requires no tools beyond a clean cloth and the adapter cable included in the box. The full process from unboxing to first light-on is typically under 20 minutes on a flat surface.
- Clean the mounting surface. Wipe the front roofline section with isopropyl alcohol (included or use 70%+ IPA). Remove any wax, road grime, or silicone residue. The automotive tape won't bond properly to a contaminated surface.
- Locate the rooftop DTP port. It sits near the front roof section, typically accessible after removing the interior sunvisor trim cover. Confirm the DTP-06-2S connector is present and capped.
- Test-fit the light bar. Hold the unit against the roof without removing the tape backing. Confirm the ABS housing sits flush against the roofline contour at the desired position. The housing is pre-formed to the Grenadier roofline — it should contact evenly across its full length.
- Route the DTP adapter cable. Feed the included cable from the roof port location toward the light bar position. The cable routes along the existing headliner gap; no cutting or removal of interior panels is required.
- Apply the tape and mount. Remove the backing from the adhesive pads on the light bar housing. Position firmly and apply even pressure for 30 seconds across the full contact surface. For best adhesion, allow 24 hours cure time before high-speed driving.
- Connect the DTP adapter. Plug the adapter cable into the rooftop DTP-06-2S port and the other end into the light bar connector. Both are keyed and weather-sealed — there's only one correct orientation.
- Test via EXT2 switch. With ignition on, press the EXT2 ceiling switch. All four LED pods should illuminate immediately. Check beam alignment from outside — the wide-flood pattern should throw forward and slightly downward.
After mounting, open both front Safari windows fully with the light bar in place. The flush-mount unit's forward position and low-profile design does not interfere with Safari window travel per DVA's design spec. If you observe any contact, verify the mounting position is at the correct forward location on the roofline as described in the included install guide.
If You Prefer Crossbar-Mounted Lighting
The crossbar approach remains viable — it's just less integrated. If you already have or want the DualTrack crossbar system, you can mount a light bar to the forward crossbar using T-slot compatible hardware. The DualTrack's 25mm T-slot accepts standard M6 T-bolts, which gives you full positioning flexibility along the rail length. The tradeoff is that you lose the forward A-pillar mount position (one crossbar slot consumed) and you accept more wind noise variability depending on crossbar position.
For owners already running DualTrack crossbars with a roof box or cargo platform forward, mounting the light bar rearward on the system works well — the load-bearing structure is solid, and rear positioning reduces the wind noise issue compared to the A-pillar slot. The DVA Side Flood Lights also mount to the DualTrack T-slot, so a crossbar-equipped Grenadier can run both the forward light bar and side floods from a single DualTrack build.
Comparison: Flush-Mount vs. Crossbar-Mounted
| Factor | Flush-Mount (DVA) | Crossbar-Mounted |
|---|---|---|
| Wind noise at speed | None reported (aerodynamic housing) | Whistle common above 50 mph (forum-confirmed) |
| Safari window clearance | ✓ No interference (forward mount) | Requires careful crossbar positioning |
| Crossbar slots used | 0 — crossbars remain fully available | 1 crossbar slot consumed |
| Reversibility | Adhesive tape — fully reversible | Fully removable hardware |
| Power routing | DTP Edition: factory DTP port (no cab wiring) | Manual wire run to fuse box or DTP splitter |
| Install time | Under 20 min | 30–60 min depending on wire run |
