Automotive Battery Diagnostics Unlocking the Secrets of Voltage Fluctuations

It's not likely that the efi would even run on 4 volts. Try turning on the headlights, watch the volt meter and light brightness at the same ... The fluctuation happens when parked and driving while increasing engine RPM's. ... First check all the wiring connections to the alternator ... Voltage varies depending on battery conditions, and which electrical loads are switched on. All the voltages you listed are in the normal range. When I start my car, my volt meter is showing a steady 13.8 volts. However, once the car heats up, or after 10 minutes driving, it drops to 11.9 ... It's caused by “clever” charging algorithms designed to save a few ml of fuel. This algorithm should only charge the battery once the battery ... The slower the engine is running and the higher the electrical load is it will cause voltage to drop slightly but if you increase engine RPM the ... yes perfectly normal. The ELD controls/adjusts the amperage outputted by your alternator depending on the load seen by the ELD. Apr 6, 2017 | 05 ... Believe it or not, the battery acts as a capacitor when the car is in use, to keep the voltage level stable. If you see the voltage going up as ... A good battery with engine off should read 12.5vdc. Your charging system (DIC) when running should read about 14.2vdc. On the way home on a 150 mile drive we noticed the volt meter fluctuate between 12 and 14 volts (I had a fluke meter with me). It was warm ...