Interesting chaps, sadly none of the permiatations deliver the desired result
However, moving on from the switch wiring I can confirm the circuit works just fine.... until that is I start the engine. With the engine running if I switch on the fog lights the fuse/fuses for the off side tail light and all the dash lights blow immediately
Where's RichardV6 when you need him
To be fair, I do recall Richard saying (prompted by Rog) it would be a good idea to up the o/s sidelight (fuse 12) from 7.5 to 15 amp, that may well bring back my dash lights and O/S tail light but I'm still foxed on the lack of switch illumination
Dave, starting with the light switch, simply connect up as per Doug's instructions using a chassis connection you will have to find/provide to allow warning LED to illuminate. You can ignore the second red/orange wire as it's not part of the intended fog light circuit, and it doesn't matter which since they are joined at a common bomb tail further up the loom that shares sidelight feed. Remember red/orange is feed to switch and blue/yellow the switched load out to your foglamps.
Fitting a relay is an option but adds complexity. MMC don't use them anywhere in the main lighting system including headlamps. My own advice is to do without assuming the switch you bought is adequate for combined fog light load. You
will need to uprate fuse 12 to 15 amp though (as you've found!) given this is nearest common value to allow a load margin, and as previously suggested. Cable size will be fine, indeed I've found plenty of copper in loom when baring the admittedly thin insulation on wires.
