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INEOS Grenadier DTP Splitter Installation Guide

INEOS Grenadier DTP Splitter Installation Guide

The DVA DTP splitter lets you run two rooftop accessories from a single Grenadier DTP port — no cutting, splicing, or modifying factory wiring. The DTP-06-2S male end plugs into any Grenadier rooftop socket; the split outputs power two devices simultaneously. Two variants cover the common use cases: the DTP-to-DTP splitter (both outputs stay DTP — use with DTP-native accessories) and the DTP-to-IP65 splitter (outputs are IP65 waterproof connectors — use for lights and accessories with thin-gauge pigtails).

Quick Answer

  1. Grenadier rooftop DTP ports (EXT2 = 25A dedicated; EXT3 = 25A shared across 3 ports).
  2. DTP splitter: one DTP-06-2S male in → two DTP-04-2P female outs. Plug-and-play, no tools.
  3. IP65 splitter: same DTP-06-2S input → two IP65 waterproof outs. Better for AWG16–24 pigtail accessories.
  4. Total load across both outputs must stay within the port's circuit rating (25A max per circuit).

Which Splitter Do You Need?

DTP-to-DTP Splitter DTP-to-IP65 Splitter
Output connector 2× DTP-04-2P Female 2× IP65 Waterproof
Wire gauge (splitter) Matched to DTP spec 16 AWG
Best for DTP-native accessories (DVA lights, Starlink, etc.) Light bars, LEDs, accessories with bare pigtails (AWG16–24)
Crimping required? No No
DVA product DTP-06-2S to 2-Way DTP04-2P Splitter DTP-06-2S to IP65 Waterproof Splitter

Understanding the Grenadier's DTP Circuits

Before loading two accessories onto a single port, it's worth knowing what circuit you're tapping:

Switch Circuit Location Rating
EXT2 Rooftop — right front Single DTP port above driver door 25A (dedicated)
EXT3 Rooftop — 3-port zone Left front, left rear, right rear 25A (shared across all 3 ports)

Key insight from the DVA Mechanics DTP Wiring Architecture guide: "EXT3 controls three DTP outlets on a single shared circuit." This means all three EXT3 ports activate and are fused together — use the splitter on any single EXT3 port and your total draw across both outputs still counts against that 25A shared fuse.

A forum member on The INEOS Grenadier Forum confirmed the common confusion:

"Three of the four external sockets all appear to run off the EXT 3 switch, with the fourth socket running off one of the other EXT switches." — INEOS Grenadier Forum, "External sockets and roof mounted switches" thread

Practical implication: with the DTP splitter installed on an EXT3 port, running a 5A scene light + a 10A fridge = 15A total, safely within the 25A circuit. But add a third accessory on a neighbouring EXT3 port and all three share the same fuse.

Does the Splitter Work on INT1 / INT2 (Interior Ports)?

A forum member asked exactly this in the DVA product thread on The INEOS Grenadier Forum (thread #12418340):

"Would this also work inside on INT 1 and 2?" — qm-dydrm-aka-advaw8s, INEOS Forum

DVA's answer:

"INT 1 and INT 2 have unterminated ends, so you don't need the DTP splitter (unless you add a DTP plug to the end). If you let us know your application, we can help make a recommendation." — DVA Mechanics, INEOS Forum

Short answer: the INT1/INT2 circuits end in bare wires (not DTP sockets), so the DTP splitter doesn't fit them natively. The splitter is designed for the factory DTP roof ports (EXT2, EXT3).

Installation: Step-by-Step

Step 1 — Choose Your Port

Select the rooftop DTP port closest to both accessories you want to power. The 3-meter cable on the splitter gives flexibility, but placing the DTP input near both endpoints keeps the run tidy. EXT2 (dedicated 25A) is the better choice if you're running higher combined loads; EXT3 ports are fine for lighting-class draws.

Step 2 — Plug In the DTP-06-2S Male End

Insert the DTP-06-2S male connector into the chosen rooftop socket with firm, steady pressure until you hear the tactile click. The connector is keyed and sealed — a partial engagement won't carry full current and will corrode faster. Apply a small film of dielectric grease to the sealing face before mating, especially on vehicles that cross water regularly.

Step 3 — Route to Your Accessories

Route the two output leads to your accessories. Secure with UV-resistant cable clamps every 300–400mm to prevent chafing on rack edges. Leave a service loop (150mm slack coil) near each output connector so vibration doesn't stress the terminations.

DTP-to-DTP variant: mate the DTP-04-2P female outputs to your accessories' DTP male plugs. They snap in one orientation.

IP65 variant: connect the IP65 connectors to your accessories' pigtails. The IP65 twist-lock coupling seals against moisture; make sure both halves thread fully.

Step 4 — Test Under Load

With the relevant EXT switch on, power both accessories simultaneously. Check:

  • Both accessories operate correctly at the same time
  • DTP input connector is ambient temperature after 5 minutes (warm = overload or partial engagement)
  • IP65 or DTP output connectors are fully seated (any warmth here indicates partial mating)

Load Management Tips

  • Measure actual draw: Use a clamp meter on the DTP lead. Rated draw for accessories is often peak, not continuous — know your real numbers.
  • EXT3 shared budget: If you're on an EXT3 port, mentally budget the 25A circuit for all devices on EXT3, not just the splitter's two outputs.
  • Inline fuse for each branch: Consider adding an inline blade fuse (sized to your individual accessory's rating) to each output leg. This protects accessories from each other — if one shorts, it doesn't drop both.
  • Compressors and fridges: High-inrush accessories (air compressors, winches, etc.) have startup spikes 2–3× their running draw. On a shared EXT3 circuit, stagger startup or use the dedicated EXT2 port.

Browse all Grenadier DTP cables: The DVA DTP Cables & Connectors collection covers the full range of factory-compatible adapters — splitters, extension cables, DTP-to-Anderson adapters, and DTP-to-IP65 pigtails.

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