If the car battery repeatedly becomes flat, this may indicate increased power consumption by a component. Using a mini-ammeter, power consumption can be measured simply and quickly for an initial check, directly on the relevant fuse in the vehicle’s fuse box.
Here, remove the fuse from the holder and insert it into the mini-ammeter’s plug. Next, insert the mini-ammeter into the fuse’s original place. The closed-circuit current, i.e. the current when the ignition is on or the engine is running, can be determined safely and reliably with the mini-ammeter.