Thanks everyone for all the help - greatly appreciated. It turns out that the hole geometry of the smaller (2 screw hole) RAM mounts perfectly aligns with the holes in the switch panels. So changing using some 20mm machine screws, they fitted perfectly - no panel removal or drilling. These mounts are for (a) iphone 15 Quadlock magnetic charger; (b) iPad running Hema maps; (c) GME CB microphone holder.... or whatever I choose as, with RAM mounts, I can swap stuff around depending on the nature of the trip. See pics.
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One more thing of interest... my brand new Grenadier Trialmaster (purchased in Australia in March 2025) does NOT have the 3-wire, 40A compressor wires as documented everywhere on this forum. Instead, it has 4 wires... these have been confirmed by INEOS Australia as being for an 240Vac inverter. INEOS confirmed that the latest batch of Grenadiers imported into Australia are (a) the newer model; (b) the "inverter ready" configuration - apparently they can be ordered with a 400W or a 2kW inverter with mains power outlets at various places in the vehicle. Regarding the 4 wires: there's a larger (40A?) yellow/green wire with 13.8V; a thin black ground wire (not large enough for the return current path from an inverter or my lithium charger); two purple and maroon signalling wires (one is LIN bus). See pics below, and diagrams from the official, latest, INEOS service/electrical manual.
My objective was to attach a Lithium battery DC-DC converter (I chose the CTEK D250SE - available same-day from Amazon and surprisingly affordable); to wire this in I used the "Inverter" constant 13.8V wire, but for ground I bolted it to the nearest chassis ground, and grabbed the "Ignition" signal to turn on/off the D250SE using a Mini-Blade fuse splitter/T-piece from Narda (bought at Repco). There's a bank of mini-blade fuses in the fuse box under the rear passenger seat that are all (except one) "ignition on" signals. So in the end it was a very simple process to install the extra lithium "third batteries" and get the requisite signals/wires for the CTEK D250SE, and install the chassis-mount Anderson connectors for my fridge, portable tyre compressors etc.. See pics.
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The four wires taped beneath the RHS rear passenger seat (in place of the 40A compressor wires) are shown below, eminating from C138. From top to bottom on the LHS...
1) Con. Fo31*2 12V (13.8V) high current wire. I used this for my Lithium battery charger.
2) Con. C074*LE10
3) Con. C074*LF18 (LIN bus)
4) CI.31 (thin Gnd wire).
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