First post, here goes...
My '03 Elise 111S (K series) developed an electrical fault which has now unfortunately turned into an intermittent one, making it harder to trace!
Initially, something caused the 10 amp fuse in slot number 7, Ignition Services, to blow, suddenly leaving the car dead with no electrics (coasting to a conveniently located pull in). This was after a run of about 30 miles (water & oil up to normal temp?). Replacing the fuse, everything was ok for another 10 miles when it happened again. My remaining spare fuse then only lasted about 10 seconds, so I got rescued and it was trailered home. The next day, armed with a bag of fuses, the car was fired up and the fault replicated (the engine warmed up to 99 degrees) but has not happened again on subsequent testing (I've only tested it stationary, as that's more convenient than getting stranded miles from home!)
I got an auto electrician to come out to have a look but as the fault was by now deemed to be intermittent, there was little he could do. He studied the wiring diagram (found online, seemed to be close enough!) and his best guess (his words, not mine) was that maybe the Stack instrument unit should be removed and sent away for testing or to stick a 15 amp fuse in place of the existent 10 amp (yeah, right!)
I'm totally lost when it comes to the invisible electrics - my first thought was that it was temperature related as it only happened when the temp was climbing but I reckon that's a red herring. I'd be really grateful if anyone has any thoughts on this?