I am having an issue that my car once in a while will not start. There is no clear pattern for the problem - only that it usually apears in varm weather (above 25 degree celsius where I live).
My battery has been tested and it should be OK. I have bought a multimeter and over a 2 months period I have meassured the voltage before and after a ride. Typically it goes up to around 13,10v after a ride, then drops to around 12,9v when the system has turned into sandby. Over night it drops 0,02-0,04v. I guess this should be OK?
According the above I also conclude that the alternator is OK.
When the problem occurs I am able to turn on the lights, I can also turn on the radio and the A/C. But turning the key to stage 3 nothing happens. Not even a sound from the starter.
Last time it happend it was very hot weather. The battery droped from 13,10v to 12,6v in about 5 hours - and the car would not start. I had it jumped and it started immediately. I am not sure if it ought to start at 12,6v.
Does anyone have an idea on what is going on?