The INEOS Grenadier ships with one of the most thoughtfully engineered auxiliary power systems in any production vehicle. Five dedicated EXT circuits, pre-wired with weatherproof DTP connectors, routed to the roof, bumper, and under-hood locations — all waiting for accessories that the vehicle doesn't actually come with.

That's not an oversight. It's an invitation.

INEOS built the electrical infrastructure. The lighting decisions are yours. And those decisions matter more than most owners realize, because how you plan your lighting build determines whether you end up with a clean, integrated system or a tangled mess of aftermarket wiring harnesses and fuse taps.

This guide covers everything: the three lighting zones on the Grenadier, what circuits power them, which products work (and which require compromises), and how to plan a lighting build that actually makes sense.

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The Grenadier's Lighting Circuits: A Quick Summary

We covered the full EXT/INT port system in detail in our Power On Demand article. Here's the lighting-relevant summary:

Every Grenadier with the Trailmaster Edition (or the optional EXT wiring package) has these circuits pre-installed. The connectors are capped and waiting behind panels and under the hood. No dealer activation required.

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The Three Lighting Zones

A well-planned Grenadier lighting build covers three distinct zones, each serving a different purpose:

You don't need all three on day one. But understanding how they work together — and which circuits power each zone — lets you build incrementally without painting yourself into a wiring corner.

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Zone 1: Roof Lighting

The roof is the highest mounting point on the vehicle, which makes it ideal for wide-area flood lighting. The tradeoff is glare — roof-mounted lights bounce off your own hood at close range, so they're best used at trail speeds or while stationary, not highway driving.

The Circuit: EXT2

Note: The Grenadier is a 12V nominal system. With the alternator running — which is when your lights are on — actual system voltage sits around 14V. All wattage calculations in this article use 14V as the realistic operating voltage.

EXT2 delivers 25A through a single DTP port on the roof. At 14V operating voltage, that's 350W of available power. A typical roof light bar draws 100–250W, so you'll never come close to the limit. This is the correct circuit for roof lighting — it's isolated from your other accessories and purpose-built for high-draw illumination.

DVA LED Roof Light Bar

The DVA Flush-Mount LED Roof Light Bar was designed around two problems that plague most Grenadier roof light installs: aesthetics and wiring.

The aesthetics problem: Most aftermarket light bars look like aftermarket light bars. They bolt on top of the roof with exposed brackets, creating visual bulk and wind noise. The DVA bar uses a precision-molded ABS body that matches the factory roof contour and mounts flush above the windshield with high-strength automotive adhesive. No drilling. No exposed brackets. From ten feet away, it looks factory.

The wiring problem: The bar includes a DTP adapter cable that plugs directly into the EXT2 rooftop port. No wiring harness to run through the firewall. No relay to mount. No fuse tap. Connect the DTP plug, route the cable along the A-pillar or roof gutter, and you're live.

How It Compares

Feature	DVA Roof Light Bar	Premium Universal LED Bar	Budget LED Bar
Output	160W / ~7,000 lm	150W / 10,800 lm	100–300W / varies
Mounting	Flush adhesive, OEM contour	Universal bolt-on brackets	Universal bolt-on
DTP Plug-in	Yes (adapter included)	No (separate harness)	No
Control	Bluetooth key fob	Wired switch or controller	Wired switch
Grenadier-Specific	Yes	No	No
Price	$899	$1,200+	$50–200

A premium universal bar is a genuinely excellent light — optically superior, with more raw lumens and a refined beam pattern. But it requires a separate wiring harness ($80–150), a relay, and a switch. It also mounts with universal brackets that sit on top of the roof, not flush with it. If absolute maximum light output is your priority regardless of integration, a premium bar is hard to beat. For everyone else, the DVA bar delivers serious illumination with a dramatically cleaner install.

Generic budget bars are tempting at $50–100, but you get what you pay for: inconsistent beam patterns, questionable waterproofing, no DTP compatibility, and brackets that require drilling or awkward clamping. They also require full wiring harness runs from the roof to under the hood.

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Zone 2: Bumper Lighting

Forward-facing bumper lights serve a different purpose than roof lights. Where roof-mounted floods illuminate a wide area from above, bumper lights throw a focused beam down the trail ahead of you. They're your primary tool for night driving on trails, fire roads, and unlit rural highways.

The Circuit: EXT1 / EXT5

Bumper lights wire into the under-hood pigtail connectors on EXT1 (10A, standard) or EXT5 (25A, High-Load Panel option). These aren't DTP ports — they're standard pigtails designed for direct connection. The DVA bumper light system includes two harness options: one for direct connection to the factory under-hood auxiliary power, and one for integration with a centralized lighting controller if you're running one.

DVA Front Bumper Light System

The bumper lighting solution is a two-part system:

Front Bumper Light Mount — A precision-engineered bracket system that positions a light bar inside the factory bumper opening. Uses existing factory mounting points for a true bolt-on install. No trimming of the bumper, grille, or plastics. No drilling. Maintains full radiator airflow and preserves the factory crash bar.

This matters because the Grenadier's bumper isn't just a cosmetic piece — it's a structural component with integrated crash protection and sensor mounts. The DVA mount works within that structure rather than modifying it.

Front Bumper 3-Light LED Bar — Three Cree LED units, each running 4 × 10W chips, for a combined ~110W and ~13,200 lumens of forward-focused illumination. The bar is engineered specifically for the DVA mount — no universal brackets, no misalignment, no visual clutter.

Amber Covers for Adverse Conditions

The Amber Snap-On Light Covers ($39, set of 3) are impact-resistant polycarbonate lenses that snap over the DVA bumper lights without tools. Amber filtering reduces glare and backscatter in fog, rain, dust, and snow — a meaningful improvement over white light in conditions where you're dealing with particulates in the air. They snap on and off in seconds.

How It Compares

The main alternative for bumper light mounting is a universal bumper bar, which mounts across the top of the bumper opening rather than inside it. It's a solid product, but it changes the bumper's visual profile significantly — you're adding a visible bar across the front of the vehicle. The DVA mount tucks lights inside the existing opening for a stealthier result that preserves the factory look.

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Zone 3: Side Lighting

Side lights fill the gap between forward illumination and overhead flood. Mounted on the roof bars, they throw light laterally — useful for illuminating trail edges, camp areas beside the vehicle, or work zones during recovery operations.

The Circuit: EXT3

Side lights plug into the EXT3 DTP ports distributed across the roof rack. Three ports are available: driver-side front, driver-side rear, and passenger-side rear. Each side light draws 30W (~2.1A at 14V), so you can run multiple lights on the shared 25A (300W) circuit without issue.

Two Options: Spot vs. Flood

Both lights share the same specs and mounting system:

The choice between spot and flood depends on how you use your vehicle. Trail runners who need to see obstacles and trail edges tend to prefer spot beams. Overlanders who camp beside the vehicle and need broad area lighting prefer flood. Many owners run one of each — flood on the camp side, spot on the trail side.

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Complete DVA Lighting Product Specs

Product	Wattage	Lumens	Beam	Mount	Circuit	Price
LED Roof Light Bar	160W	~7,000	Wide flood	Flush adhesive	EXT2 DTP	$899
Front Bumper Mount	—	—	—	Bolt-on	—	$499
Bumper 3-Light Bar	~110W	~13,200	Forward driving	DVA mount	EXT1/EXT5	$399
Bumper Light Kit	~110W	~13,200	Forward driving	Bolt-on	EXT1/EXT5	$799
LED Side Light	30W	2,400	Spot	Roof bar clamp	EXT3 DTP	$169 / $299
LED Side Flood	30W	2,400	Flood	Roof bar clamp	EXT3 DTP	$169 / $299
Amber Covers	—	—	—	Snap-on	—	$39
DTP Splitter	—	—	—	DTP plug-in	Any DTP	$29

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Planning Your Lighting Build

Circuit Allocation — Full Build

Circuit	Fuse	Load	Headroom
EXT2 25A / 350W	Roof Light Bar	160W	190W available
EXT3 25A / 300W	2× Side Lights	60W	150W available
EXT1 10A / 120W	Bumper 3-Light Bar	110W	240W available
EXT5 25A / 350W	Available	0W	350W available

Notice how much headroom remains on every circuit. You could add a second pair of side lights, a rear scene light, or auxiliary accessories without approaching any fuse limit. The Grenadier's electrical system was designed with expansion in mind — the lighting build just uses a fraction of what's available.

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The Full-Build Example

Here's what a complete three-zone lighting build looks like in practice:

That's the Grenadier lighting build, done right.