Front fixed and portable rear winch specifications, electrical demands, permissible pull angles, and the dedicated 500A EXT4 circuit that powers it all.
Quick Answer: INEOS Grenadier Winch Specs
- Front fixed winch: 55 kN maximum pull force, ~350A peak draw, 150A continuous — powered by the dedicated EXT4 circuit (rated 500A, fused at 350A)
- Rear portable winch: 35 kN maximum pull force via the NATO auxiliary socket — INEOS endorses this socket for the factory rear winch only
- Operating angles: ±45° vertical, ±30° horizontal — outside these limits off-axis loading deteriorates mechanical advantage
- Aftermarket fitment: requires INEOS departmental approval and a cross-member retrofit — not a universal bolt-in
Front vs. Rear: The Architecture Decision
The fixed front winch delivers 55kN maximum pulling force in the x-direction. If you're buying a vehicle already fitted with a fixed winch, INEOS has already modified the front cross member. Retrofitting one later requires that same cross-member modification — it's a structural change, not an accessory swap.
The portable rear winch maxes out at 35kN in the x-direction. It requires both the auxiliary socket cable set AND the cross-member retrofit. One owner on The INEOS Forum summarised the distinction well: "The NATO socket is a serious piece of kit — but Ineos does not endorse using it for anything other than the removable rear winch." (The INEOS Forum — NATO socket options thread)
| Parameter | Front Fixed Winch | Portable Rear Winch |
|---|---|---|
| Max Pull Force | 55 kN | 35 kN |
| Direction | X-axis | X-axis |
| Peak Current | ~350A at 12V | — |
| Continuous Current | 150A at 12V | — |
| Circuit Breaker | Yes | — |
| Cross Member | Factory (winch-equipped vehicles) | Retrofit required |
| Dedicated Circuit | EXT4 — 500A rated, 350A fused | Via NATO auxiliary socket |
Electrical Reality: The 500A Label vs. the 350A Fuse
One of the most common points of confusion on owner forums is the difference between the EXT4 circuit's rating label and its actual fuse. The EXT4 switch is labelled 500A — but the fuse protecting the circuit is 350A. That 350A figure is your real operational ceiling for peak draw. The forum community has documented this clearly: "A reminder that the switch is labelled as 500A but the fuse is 350A." (The INEOS Forum)
For continuous operation, the front winch is limited to 150A at 12V with circuit breaker protection. Peak draw of ~350A happens during initial spool-up against maximum resistance. Continuous reflects sustained pulling — the number that matters for heat management across extended recovery sequences.
The EXT4 circuit is accessed via the front right wheel well behind the cover. It is a dedicated circuit with its own switch, isolating winch operation completely from the rest of the vehicle's electrical load. At 500A rated capacity, it is the highest-current factory auxiliary circuit on any production 4x4.
EXT Circuit Summary
- EXT4 label: 500A rated
- EXT4 fuse: 350A (operational ceiling)
- EXT4 location: Front right wheel well, behind cover
- Continuous rating: 150A at 12V (circuit breaker protected)
- Peak draw: ~350A at 12V (initial spool-up under maximum resistance)
If you're running significant auxiliary electrical loads alongside the winch — lighting arrays, compressors, dual-battery charging — managing your draw intelligently matters. The DVA Exterior PowerVault provides a clean, weatherproof hub for managing auxiliary 12V circuits on the Grenadier without tapping into the body harness or competing with the winch circuit for current.
Permissible Pull Angles
The winch is engineered for x-axis pulls within a specific angular envelope. Operating outside these limits increases off-axis loading on the fairlead, introduces uneven drum layering, and accelerates cable or synthetic rope fatigue.
Operating Envelope
- Vertical: ±45°
- Horizontal: ±30°
- Outside these angles: off-axis loading increases and mechanical advantage deteriorates
- Rope as pulley: the loose end must be attached to vehicle structure (e.g., a lashing eye) — do not allow free-hanging rope ends under load
In practice, a ±30° horizontal limit means a snatch block becomes essential for any off-axis vehicle recovery where the anchor point is not directly in front of the vehicle. A snatch block redirects the pull vector and keeps the load within the mechanical envelope. For overland preparedness, carrying a quality snatch block and rated recovery boards is as important as the winch itself.
The DVA Recovery Board Carrier mounts to the Grenadier's rear ladder and keeps MAXTRAX, Hi-Lift boards, or sand ladders accessible without consuming interior space — the practical complement to a factory winch setup for technical terrain recovery.
Aftermarket Winches
Aftermarket cable winches must be coordinated with INEOS for design approval and mounting location. The factory has completed structural analysis for the OEM winch and its cross-member integration. Aftermarket fitment requires departmental approval — you cannot assume any winch will bolt into the existing structure without engineering sign-off.
This isn't bureaucratic caution: the cross-member modification that accommodates a winch is a load-bearing structural change. INEOS designed the system as a complete package. If you're specifying a non-factory winch, start that conversation with INEOS or a certified body builder before committing to a product.
DVA Grenadier Recovery & Accessory Gear
A properly-installed winch is only part of a complete recovery system. The gear you carry alongside it — recovery boards, cargo management, auxiliary power — determines how effective that system is in the field. DVA builds Grenadier-specific accessories to the same engineering standard as the vehicle itself.
- Exterior PowerVault — Weatherproof 12V auxiliary hub. Manage lighting, compressors, and accessories without competing with the EXT4 winch circuit.
- Rear Ladder Recovery Board Carrier — Mounts to the factory rear ladder. Keeps recovery boards accessible and secure without sacrificing cargo space.
- Full INEOS Grenadier Accessories Collection — Roof rails, side steps, accessory carriers, utility mounts — purpose-built for the platform.
