When replacing the alternator on a 1990 Toyota, check the amperage rating on the placard on the alternator. The alternator is available in different amperages, depending on the electrical accessories on your particular car model. When an alternator begins to fail, the diode trio is usually the ...
Automobile engines run on air, fuel, and spark. While the battery supplies the electricity needed for that initial spark, it only has enough power to get the car a few miles down the road, and that's where the alternator comes in—it continually charges the car battery while the car is...
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Checking alternator output using an ammeter in series with the charging system should be done only by an auto-electrician. A safe test can be made with an induction ammeter held parallel to the output cable, but it is less reliable. Testing drive belt tension Check drive-belt tension on th...
ALTERNATOR OVERHEATING High underhood temperatures are hard on alternators, and high electrical loads create even more heat. The higher the charging load on the alternator, the hotter it runs. To control the heat, alternators have an internal and/or external fan that pulls air through the housing...
An alternator is a maintenance-free unit. In some cars, it can last for up to 10-15 years without any repairs. If an alternator fails, the car may still run for a short time on battery power. However, the engine will stall as soon as the battery charge is depleted. Replacing an alt...
Therefore you would never see anything above 10 such as current battery voltage or when testing an alternator’s output. So we’ll need to set this at 50 instead and use the appropriate readout on the needle swipe. Touching the black on the ground terminal and the red on the positive, ...
Let’s take a closer look at the roles the car battery, starter and alternator play in your car and how they work together to get you on the road.
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It's both useful and empowering to know how to fix your own car. Whether you need to test the condition of your car battery, fix your AC, or simply change your tires, learn how with these step-by-step tutorials.