A DMM with the ability to measure continuous current to 10A will be fine in most cases, though one rated 20A would be less prone to blowing a fuse. What You’ll NeedĪ digital multimeter is best for this test as opposed to an analog one, which is not as accurately read. In addition, any number of fancy electronics systems that are installed on newer cars could be playing up, such as your GPS or proximity key system. It could be anything from a dimming dome light staying awake or glove compartment switch sticking on, to faulty aftermarket radio or alarm wiring. A certain amount of draw is normal – in the region of 25mA (milliamps) – but if you have 100mA or more being lost, something is up. It typically happens due to a short circuit that can be tricky to pin down. The result can often lead to a flat, caused not by a faulty battery or through something obvious like the headlights being left on. On occasion, a battery may experience significant drain long after the engine has been shut off.
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