Hello guys, I have the problem that my car is currently starting in summer too. Now I have collected some data with a good multimeter which I would like to discuss with you, because I do not exchange the car battery for example and after that it is the starter or the alternator. Now to the data: car stands, no ignition, no consumers: 12.09 car in idle, no consumers 14.5 car in idle, many consumers: tendency over 15min falling to 14 ,2 —- Test finished car idle , only few consumers: Trend in still slightly falling — — Test stopped car ignition, consumers: Falling tendency can be clearly detected second-hand Auto ignition, all consumers out: value has settled at 12.5 The question to you is how can I interpret the values? 1. Should the alternator in idle and many consumers not keep the voltage? Trend was falling. Nevertheless, it was at the end to 12.5 charged by original 12.09 2. is the value 12.09 at the beginning of the tests little (new car battery?) How do I interpret the test: car battery beginning 12.09 , ignition on, value 14.5, consumer on, value slowly falling —–> alternator defective? Can an alternator supply electricity for charging but possibly too little because the is defective? As you can see ……… Questions about questions!!!! Would I be pleased about helping answers