Went out to start the cat yesterday and out of character she failed to start,weirdly I had nothing not even faint ignition lights....my particular v6 is always turn key reliable and has never given me any mechanical concerns...put it on a battery conditioner/charger overnight and again this morning nothing at all. Jumped it off my other car and it fired straight up and has been ok since, I have a cheapo battery and alternator tester and both are showing ok.....anyone got any clue as to what this could be as I was convinced it was a battery going down but not sure now as it's been ok since??