Start With the Exact Handbook
Fuse locations, labels, auxiliary packages, and outlet assignments can change by model year and configuration. Use the handbook delivered for the vehicle and verify the fitted harness. The MY26 Overview section supplies the physical EXT2/EXT3 roof-output map that the previous article said was unavailable.
MY26 Roof Circuit Map
| Switch | Outputs | Published circuit |
|---|---|---|
| EXT2 | Front-right roof outlet | 25 A circuit A |
| EXT3 | Front-left, rear-left, rear-right roof outlets | 25 A circuit B, shared |
A Fuse Protects the Circuit
The accessory load must remain within every limit in the path: vehicle circuit, wire, connector, branch protection, switch or relay, and device. A larger replacement fuse does not create capacity and can remove the protection the harness was designed to have.
Planning Worksheet
- Vehicle model year, body style, market, and auxiliary package.
- Switch and physical output verified from the matching handbook.
- Continuous current and inrush from the device maker.
- Combined current for every device sharing a circuit.
- Connector, conductor, protection, routing, sealing, and strain relief.
- Post-install polarity, voltage, heat, and fault checks.
Owner Reality Check
Only when switching on the INT2 roof button, together with the PWR on button, did I get 12V power on the wire!
— Jean Mercier, The INEOS Forum, June 2023
Read the cited owner discussion. Owner reports identify practical questions; the OEM or product documentation establishes specifications and procedures.
Allocate Loads Before Building the Harness
Make one row for every device: circuit, physical outlet, continuous current, startup current, duty cycle, branch protection, connector, and conductor. “Inrush” is the brief startup demand; it can exceed the steady draw. “Strain relief” prevents cable movement from transferring force into a terminal or seal. Add every EXT3 device in one total because three physical outlets share one circuit.
| Question | Decision rule |
|---|---|
| One device on EXT2? | Verify its documented continuous and startup demand against the complete EXT2 path. |
| Several devices on EXT3? | Add them together; three outlets do not create three circuit budgets. |
| Unknown draw or wire identity? | Stop and measure/trace it before terminating the harness. |
| Blown fuse? | Find the overload or fault; never “solve” it with a larger fuse. |
Does anyone know which fuse in which fuse box is behind the roof panel switch no ‘6’… the power for three of the rooftop outlets totalling 25A.
— Wazza, The INEOS Forum, “Fuse Location,” May 2024
The question shows the practical trap: the switch, physical outlets, and fuse documentation must be traced as one circuit. Read the owner discussion.
DVA Circuit-Specific Products
The LED Side Flood Light and PowerVault Utility Hub use Grenadier accessory interfaces; the DTP cable collection provides current cable options. Verify the total circuit load for the exact vehicle before connecting more than one device.
INEOS Grenadier: LED Side Flood Light – Roof Bar Mount & DTP Plug-In
Current fitment, configuration, included hardware, and technical details are maintained on the live product page.
Sources
- INEOS Grenadier MY26 U.S. Owner’s Handbook
- Owner report: right-side auxiliary footwell circuit
- DVA Side Flood Light live product page
The DVA Setup for This
Plan the Grenadier system from verified limits
Use the live DVA product pages for current fitment, included hardware, price, and installation requirements. Product hardware does not increase the vehicle rating.
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