Ok, here are a few pics, hopefully have most of it covered:-
Obviously take the 3 bolts holding the tray out, also remove the 2 that hold the fuse board in place, it's in the way if not.
The onboard power supply control unit is circled in red here.
Remove 2 x 10mm nuts to get better access, you can flip the unit over towards you so you can access the connectors and cables more easily (remember, disconnecting the 12pin connector set my headlamp washers on permanent so disconnect the battery first if you want to disconnect the plug).
Hopefully this is clear enough, I've circled the connectors I spliced in for the indicators in red, and for the fogs in green. This way I can remove the solution easily if required (just connect the connectors directly to bypass it).
Here is a pic of the box opened up as I was about to the replace the resistors, will refit this afternoon and test again!
FYI I used the ground point to the right of the footwell to provide ground to the device.
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