Ok - earlier thread, needed to supply a cable through my bulkhead for my horn. Took dash apart and managed to get one through.
Put dash back together, put connectors on. All ok apart from the last connector which is an extra switch which 3 cables go onto the back. It was going dark and I thought I had the cables on right, except when I put the last one on I had a little blue spark - then I realised that a) I hadnt removed the negative on the battery, and b) the keys were in the ignition and it was on (I know, plank - but I had been checking each connection as it had gone back on to make sure it was working) I straight away thought blown fuse, but checked everything and it seemed to be working. Up until I came to start the engine.
Key in - one turn, everything fires up, on dash, lights, stereo, fuel pumps etc. Second turn - everything goes off.
What have I done - any ideas?