INEOS Grenadier Camp Lights: EXT3 Setup, 3 DTP Zones & House Battery Tips

Which Circuit Is Best for Camp Lights?

The Grenadier's rooftop auxiliary system has four roof-mounted DTP outputs when the High-Power Aux option is fitted — two on EXT2 and three on EXT3. EXT2 is dedicated (its own 25A circuit, one output above the front passenger door) and is best for a front-facing light bar. EXT3 is the camp lights circuit: it distributes three DTP access points across the driver's side and rear of the roof from a single 25A shared circuit.

Note: EXT3 being a shared 25A circuit means all three roof DTP outputs draw from the same 25A budget. Two 30W flood lights (≈2.5A each at 12V) combined draw 5A — well within budget. Problems only arise if owners try to hang a 200W+ light bar across an EXT3 socket that also powers smaller accessories.

The DTP Connector: What You're Actually Working With

The roof DTP sockets are 25-amp Deutsch two-pin plugs — specifically DTP06-2S (male housing, female pins) with a wedgelock retainer. Wire gauge in the factory harness runs 14–12 AWG. The mating connector for any light or cable you add is DTP04-2P (female housing, male pins).

"The 25 amp Deutsch plugs used in the INEOS are two pin DTP style plugs, with size 12 pins rated at 25 amps (14-12 AWG wire size). These plugs can be found on the roof (4 locations on the IG, but only 2 locations on the QM) — if you selected the auxiliary power option."

— thedocaus, The Grenadier Forum, DTP connectors on roof thread

The practical implication: any light or cable you connect to EXT3 needs a DTP04-2P male plug at the connector end. Lights built for Grenadier DTP integration (including DVA's LED Side Lights and Flood Lights) arrive pre-fitted with this connector — plug in, clamp to the roof bar, and you're live. Third-party lights require a DTP04-2P crimp kit to terminate the wiring correctly.

Setting Up Camp Lights via EXT3: Step by Step

The full setup takes under 30 minutes for anyone who has opened the overhead console before. Here's the process for a two-light campsite configuration:

1. Identify the EXT3 driver-rear DTP socket. Open the load bar electrical cover on the driver's side. The rear socket is the one closest to the tailgate — that's your primary camp light connection point, as it provides the widest angle from the vehicle center.
2. Connect a DTP splitter cable. Plug the DVA DTP Splitter (DTP06-2S male → two DTP04-2P female outputs, 15 cm + 100 cm pigtail lengths) into the EXT3 driver-rear socket. The 15 cm pigtail feeds one light on the near side; the 100 cm pigtail reaches the second light positioned further along the roof bar.
3. Mount the flood lights. Clamp each DVA LED Side Flood Light to the roof load bar. The clamp jaw fits both the factory 40mm load bar and aftermarket bars up to 50mm. Orient the flood beam downward at roughly 30° from horizontal to illuminate a 6–8m campsite radius.
4. Route cables cleanly. Use the factory cable guides on the load bar cover to run the DTP cable parallel to the roof rail. Avoid routing cables across the gap between the load bar and roof where repeated flex can crack insulation.
5. Test before sealing. Turn on the Overhead PWR switch, then flick the EXT3 switch. Both lights should illuminate. If only one fires, check that the DTP splitter wedgelock is fully seated (there's an audible click when correctly engaged).

The PWR Switch Problem — and the Auxiliary Battery Fix

EXT3 (along with all Grenadier auxiliary circuits) runs ignition-assisted by default. That means the PWR switch in the overhead console must remain on for EXT3 to deliver power, and the circuit is momentarily interrupted during engine cranking when battery voltage dips. For camp lights you plan to run with the engine off, there are two consequences to know about:

• PWR switch must stay on. Leaving the ignition key in the "auxiliary" position keeps the PWR circuit alive, but this draws from the starter battery.
• Engine-start interruption. When the engine starts or stops, DTP-powered accessories see a momentary voltage drop. Not a problem for basic LED lights (they handle brief undervoltage), but it causes some sensitive electronics like dashcams or comms devices to reboot.

"I want to change the 3 exterior lights to be turned on by my switchpro rather than by the overhead switch. I have already changed the aux power to come from my house battery but I didn't like having to leave the power switch on in order to have the camp lights on. Plus I want to be able to turn those lights on remotely for a middle of the night potty walk."

— the_ick (Utah), The Grenadier Forum, Change EXT3 relay signal wire thread

The cleanest solution for all-night camp lighting: run a dedicated wire from your auxiliary battery to the roof, bypassing the EXT3 relay entirely. This keeps the camp lights on a separate power budget and removes the PWR-switch dependency.

"Anyone have a good walk through on running power from the battery out to the roof? My current plan is to run the ground and high white to the existing EXT3 plug and run a separate 14/2 wire for the high red and low red to my powerswitch under the rear seat… thinking of running the new wire up the pillars and adding a new hole in the load bar sealed with a gland/grommet."

— Member (Long Beach), The Grenadier Forum, Roof Power Walkthrough thread

The wire-run approach: remove the A-pillar or B-pillar trim, feed 14 AWG from the auxiliary battery through a gland/grommet into the load bar cover, terminate in a DTP04-2P connector, and wire to a dedicated toggle or smart switch (SwitchPro, Pacbrake, etc.) inside the cabin. Owners report 60–90 minutes for a clean B-pillar run if you've removed the trim before.

DVA Camp Light Options for the Grenadier

There are two DVA lights specifically built for campsite use on the Grenadier's factory roof bar system:

Where to Position Camp Lights for Maximum Coverage

Position matters as much as wattage. Two 30W floods mounted at the wrong angle waste half their output on the sky or nearby terrain. Here's what forum owners have converged on after testing:

• Driver rear DTP socket, angled 30° downward toward the campsite side. This is the highest-value position: coverage begins 0.5m from the vehicle and extends to roughly 7m. The driver rear socket on EXT3 is the correct starting point for any camp lighting build.
• Second light on the passenger rear DTP socket (via splitter) angled toward the rear of the vehicle. Covers the tailgate/cooking area where most campsite activity happens.
• Avoid angling lights forward from the roof. Forward-facing lights on EXT3 create glare visible to oncoming trail traffic and illuminate the hood rather than the living area.
• Red-mode accessories (for preserving night vision) need a separate feed — EXT3 drives the DTP signal; red channel lighting requires a second independent wire run and its own switch (per the Long Beach owner's forum plan above).