Flood Lights Wiring - INEOS Grenadier

To wire flood lights on your INEOS Grenadier, plug into one of the three DTP roof connectors—no relay, no wiring harness, no fuse tap. Each roof DTP port delivers 25A (350W at 14V operating voltage). Most flood lights draw 1.3–6A per unit, so you can run two or three off a single port through a DT splitter cable. The only wiring challenge: most aftermarket flood lights ship with Deutsch DT connectors, not DTP—so you'll need a DT-to-DTP adapter before you can plug into the roof.

The Grenadier Roof Wiring System: What You're Working With

The Grenadier (Trailmaster Edition or with optional EXT wiring package) arrives pre-wired for roof accessories. There are four DTP connector locations on the roof—three on or near the roof rack, one center-roof for a dedicated light bar. These circuits are already fused and routed through the vehicle's electrical system:

The critical detail most forum posts miss: The Grenadier runs at 12V nominal, but with the alternator running (which is when your lights are on), actual system voltage is ~14V. All amp and watt calculations here use 14V. A 30W flood light at 14V draws 2.1A—not 2.5A at 12V. This matters when you're calculating whether three lights can share a single EXT3 port.

The DTP Connector: What Parts You Actually Need

The Grenadier's roof DTP connectors use Deutsch DTP-series 2-way connectors with size 12 pins rated at 25A, designed for 14–12AWG wire. This is a different connector family than the standard DT series—they are not interchangeable directly.

Part numbers you need:

• DTP06-2S — Male housing with female pins (plugs into the vehicle's female roof outlet). The "2S" means two sockets; this is the connector that mates with the Grenadier's factory cap.
• DTP04-2P — Female housing with male pins (if you're making the light-side end of a custom cable).
• W2S — Wedgelock for the DTP06-2S housing (locks pins in place; mandatory for vibration resistance).
• Size 12 contacts — Deutsch 1062-12-0122 (socket) or 1062-12-0144 (pin), rated 25A each.

Forum member reidanerg (Los Angeles, April 2026) clarified a common confusion: "To connect a light bar to the roof AUX DTP connectors, all you need is the contacts for the male plug that's provided. I thought it was a dummy plug but it isn't—it's functional and just needs the contacts installed." The housing cap on the roof is a real DTP housing, not a blanking cap. Install contacts into it and run wire directly to your light.

Forum member thedocaus (Eromanga, Australia) added the full technical detail: DTP06-2S with wedgelock, DTP04-2P for the opposing end. Wire size: 14–12AWG for full 25A capacity. Correct crimping requires a Deutsch DTP crimping tool (typically the HDT-48-00 or equivalent)—pin-extraction and insertion by hand will not seat them correctly under vibration.

The DT-to-DTP Adapter Problem (And How to Solve It)

Most aftermarket LED flood lights—including popular brands like Stedi, Lightforce, and ARB—ship with Deutsch DT connectors, not DTP. The DT and DTP housings look similar but have different pin sizes, locking tabs, and sealing specs. You cannot push a DT connector into a DTP socket.

Your two options:

Option A: Buy a Pre-Made DT-to-DTP Adapter Pigtail

Several Australian suppliers and Agile Offroad (US) sell pre-made adapter leads: DT plug on one end, DTP socket on the other, appropriately fused and wired. These run $20–40 each and take 10 minutes to install. This is the fastest route if you're running a single light.

Option B: Make Your Own DT-to-DTP Adapter

Forum member thedocaus explains the method: crimp DTP contacts onto one end of a 14AWG lead (using the DTP crimper), then crimp DT contacts onto the other end. Use heat-shrink tubing on both ends and cover with convoluted loom. This approach is cheaper at scale if you're running multiple lights and gives you complete control over wire length.

Option C: Replace the Light's Connector Entirely

For lights that will be permanently mounted, some owners cut off the DT connector and crimp a DTP connector directly onto the light's pigtail wires. This eliminates the adapter entirely and results in a cleaner, weatherproof connection. Requires the DTP crimping tool and appropriate contacts—no other tools needed beyond a wire stripper.

How Many Flood Lights Can You Run Per DTP Port?

Each EXT3 DTP port is rated 25A shared across the three roof rack locations. In practice, each individual port can source its share of that 25A budget. Here's how to calculate:

• Stedi Micro V2 7.8" LED flood: 15.6W at 12V → ~1.1A at 14V. Three of these = 3.3A total. Well within a single port.
• A typical 40W aftermarket LED pod: 40W ÷ 14V = ~2.9A. Three of these = 8.7A. Fine on one port.
• A 100W LED work flood: 100W ÷ 14V = ~7.1A. Two of these = 14.2A. Still within the 25A limit but approaching significant draw—consider dedicated port per light.

Forum member shopkeep (who ran the detailed Stedi work-light install on the roof grab bar) confirmed: "I am powering all three lights through the right front roof power connection. No issue, since one light draws 1.3A at 12V." He used a 3-way DT splitter cable (Amazon) to distribute one DTP port to three separate DT connectors—one per light.

The practical rule: if your combined light draw is under 15A on one port, you have comfortable headroom. Above 15A, split across two EXT3 ports.

Three Installation Methods: Grab Bar, Roof Rack, and Utility Belt

Method 1: Roof Grab Bar Flood Lights (Camp / Side Lighting)

The Grenadier's two front roof grab bars run transversely across the roofline. Forum owners have found these ideal for downward-facing flood lights that illuminate the area around the vehicle at camp. The bars accept standard clamp mounts (22–30mm clamp size).

Hardware per light:

• NiLight or equivalent 1" (22–30mm) bar clamps. Note: NiLight clamps use M10 bolts; Stedi bracket is M8—use 10mm M10→M8 sleeve adapters and 20mm M8 bolts with lock nuts.
• Pre-made DT-to-DTP adapter pigtail (or make your own per above)
• 1x 3-way DT splitter cable if running 3 lights from one DTP port

Wire routing: run the single DTP plug to the right front roof DTP port, then split via the 3-way DT cable across the two grab-bar lights and any rear-facing work light. Route wire along the roofline gutter and secure with stainless loom clips every 30 cm.

Method 2: Roof Rack Rail Flood Lights (360° Coverage)

If you have a full or 3/4 platform rack, lights can mount to the rack rails directly using T-slot hardware or standard rail clamps. This positions the lights higher than the grab bars and allows for wider-angle placement. EXT3 provides three individual DTP ports across the rack (driver front, driver rear, passenger rear)—one per zone.

Best practice for this method: run each light to its own nearest EXT3 port. This eliminates the splitter cable entirely and gives each light its own circuit. Clean, minimal routing, and easier to troubleshoot if one light fails.

Method 3: DVA DualTrack Crossbar-Mounted Lights

The DVA DualTrack™ Crossbar System includes integral L-track channels that accept clamp-style light mounts at any position along the bar. This is the most flexible mounting option because you can slide lights fore-aft to optimize their angle without drilling or re-clamping. Combined with the DVA L-Track Threaded Lugs, lights lock positively and won't shift on corrugated tracks.

Side-Mount Flood Lights: EXT3 or Interior Circuit?

For flood lights mounted to the side of the vehicle (grab rails, utility belt, side accessory carrier), your routing options are:

• EXT3 roof port with long cable run: Route down the A or C pillar inside the door seal. Weatherproof, but requires routing through interior seals—add ~2 meters of 14AWG per side.
• Interior INT circuits: The Grenadier's interior bare-wire circuits (INT1–INT2) provide 10A each at the rear and footwell locations. Forum owner labrat used one for footwell LEDs and USB charging—these can power low-draw side lights without running wires from the roof.
• Cargo socket: The 15A cargo area socket (ignition-switched) works for low-draw accessories that need a simple plug-in.

Forum member thedocaus on side-mount flood lights: "There are threads with different lights owners have used on the rooftop outlets. They fall into three broad categories: front facing LED lightbars, rear facing work lights, or side mounted work lights/camping lights." The DTP roof ports are the preferred source for all three because they're already fused and weatherproofed—no additional protection needed.

Wiring Step-by-Step

Step 1 — Calculate Your Load

Add up the wattage of every light you plan to run off one port. Divide by 14V to get amps. Keep total under 20A per port to maintain a safety margin. Example: 4× 15W floods = 60W ÷ 14V = 4.3A. Perfectly fine.

Step 2 — Prep Your Connectors

If your lights have DT connectors: make a DT-to-DTP adapter per Option A or B above. If your lights have bare wire or ring terminals: crimp DTP contacts directly (DTP04-2P housing, size 12 female contacts). Double-check pin seating—each contact should click audibly into the housing before installing the wedgelock.

Step 3 — Locate Your DTP Port

On a Trailmaster or vehicle with EXT wiring: remove the orange dust cap from the desired roof DTP port. You'll see the female 2-pin DTP housing. Press your male connector in until the secondary lock engages—there should be no rattle.

Step 4 — Route the Cable

For roof grab bar lights: route wire along the gutter channel between the grab bar and the roofline. For rack lights: follow the crossbar outboard edge and drop into the roof rail gutter. Use convoluted loom (split conduit) over any exposed runs and secure with stainless cable clips at 25–30 cm intervals. Avoid running wires across moving parts or heat sources (exhausts, turbo heat shields).

Step 5 — Test Before Final Tidy

With the ignition in accessory position, activate the roof circuit (factory switch panel or your EXT3 channel) and confirm all lights illuminate. Check for any flickering (indicates loose pin seating) before final cable management. Re-torque all clamps to manufacturer spec.

DVA Products for Grenadier Flood Light Wiring

• INEOS Grenadier Auxiliary Lighting Engineering Guide — Full deep-dive on all three lighting zones, circuit wiring, and DTP connection process for DVA lights.
• DVA DualTrack™ Crossbar System — Low-profile crossbars with integral L-track channel for flood light mounting at any position.
• 8-Pack Heavy-Duty L-Track Threaded Lugs — Captive anchors for locking lights to DualTrack bars; no fore-aft movement under hard braking or off-road terrain.
• Awning Mount for DualTrack Roof Rails — Run an awning on the same bars as your flood lights without hardware conflicts.
• Full INEOS Grenadier Accessories Collection — All Grenadier-specific lighting, power, and mounting accessories.

Common Mistakes When Wiring Grenadier Flood Lights

Using the Wrong Connector Family

DT and DTP look similar but are incompatible. Forcing a DT connector into a DTP housing will damage the pin contacts and potentially compromise the weatherseal. Always verify connector type before purchase. If unsure: look at the housing body—DTP housings are slightly wider with a different keying tab orientation than DT.

Skipping the Wedgelock

Deutsch connectors require a wedgelock to mechanically lock pins in position. Without it, vibration will back pins out over time, causing intermittent failure. The wedgelock is included with the housing—use it.

Undersized Wire

The DTP pins are rated for 14–12AWG. Running 16AWG to a high-draw light (above 10A) creates a resistive drop that reduces light output and generates heat in the wire. Use 14AWG minimum for any flood light install.

No Secondary Securing at Light Mount

Bar clamps and T-track hardware can loosen under sustained off-road vibration. Always add a secondary cable tie or stainless lock wire through the clamp bolt head after torquing. Recheck after the first 500 miles on rough terrain.

Frequently Asked Questions

Do I need to activate the DTP ports at a dealer?

No. On any Trailmaster Edition or vehicle with the EXT wiring package, the roof DTP ports are live as soon as the EXT circuit is switched on. No dealer activation, no coding, no programming required.

Can I run flood lights on the EXT2 port?

EXT2 is the center-roof port purpose-built for a high-output light bar. You can connect flood lights to it, but it's a single port with no built-in distribution. EXT3's three ports make it a better choice for multiple flood light circuits. Reserve EXT2 for a bar.

What's the maximum wattage I can run per port?

25A × 14V = 350W theoretical max. In practice, stay under 300W per port to leave thermal and fuse headroom. That's ten 30W flood lights from a single port—far more than any Grenadier owner would realistically run.

Do I need a switch for each light?

No separate switch is required. The EXT3 circuit is controlled by the vehicle's built-in switch panel (for Trailmaster) or the EXT toggle in the dash. All lights connected to one EXT3 port switch together. If you need independent switching per light, add an inline switch (available from Deutsch's accessory catalog) between the splitter and each light.

Will wiring flood lights void my warranty?

Using the factory EXT DTP ports as designed—within their rated load—should not void warranty on related vehicle systems. Do not exceed fuse ratings or modify the vehicle's wiring loom. Installing accessories via the factory DTP connectors is exactly what INEOS designed the system for.

Key Specs at a Glance

• Roof DTP port type: Deutsch DTP-series, 2-pin, 25A per port
• Pin part numbers: DTP06-2S (male housing), DTP04-2P (female housing), size 12 contacts
• Wire gauge: 14–12AWG minimum
• EXT3 capacity: 25A shared across 3 ports (driver front, driver rear, passenger rear)
• EXT2 capacity: 25A dedicated (center roof, single port)
• Operating voltage: ~14V (alternator running)
• Typical flood light draw: 1.1–7A per unit at 14V depending on wattage

For the full circuit-by-circuit breakdown of every EXT and INT port on the Grenadier, see the INEOS Grenadier EXT & INT Power System Guide.

Sources: INEOS Grenadier Trailmaster technical documentation; The INEOS Forum threads For those wondering how to connect to DTP connectors on roof (Apr 2026), Work light on roof grab bar (Jun 2024), Sidemount floodlights and footwell power points (Apr 2025).