On sat I drove around town dropping off kid's to sport,shopping etc.. clocked up about 40 KM.

Sunday hopped in car to go to a mates place,turned key nothing, no click dead ,the only wierd thing was my fuel,temp,and fuel comsumption was flicking up and down with the key out!!

Got a jump start drove for 30 min,left car for 1hr,car starts fine.

No lights were left on.

What happend???