12/25/2023 0 Comments Car battery indicator dashboardThe reading should be between 14 and15 Volts on most cars. So how do you check an alternator? While the engine is running, connect the voltmeter as before. Symptoms of a faulty alternator include car not starting, headlights dimming or a charging system warning light on the dashboard. Faulty Alternator – Check the AlternatorĪ faulty or dying alternator is usually the problem, if the battery checks out ok. Car electrics can be complicated so now could be a good time to hire a mechanic or auto electrician. If all of the above check out ok, then you are going to have to delve a bit deeper. To start with, check the fuse for the starter motor and the fuse for the alternator.Īgain, check the user manual for more information about the location of the fusebox and individual fuses. ![]() They can become brittle and worn with age, and a cold engine start may be too much for them to handle. Fuses can sometimes just blow, especially on older cars for no reason. Sometimes a simple fuse can be stopping your car from starting. It’s unlikely that the wiring has become damaged as it’s usually fairly thick and well protected, but it is still worth checking on older cars. Corroded terminals can be cleaned up using a wire brush or sand-paper. If your car is a bit older, then the battery terminals may be corroded or may have come loose. ![]() It’s usually best to check the vehicle handbook first. You may need to remove a few plastic covers first to get to the battery. This can be difficult to do on modern cars where batteries are fitted into tight compartments in the trunk or engine bay. Bad connections to battery – Check the Battery terminals and wiring Using a multimeter/voltmeter to check the voltage level in a car battery 2. If it is less, then the battery has not charged properly, more then there may be a problem with the alternator.
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