A regulated power supply will put out the same power regardless of the vehicle voltage. With these batteries, you can power volt components ignition and starter, for example from one post and volt accessories from the other. It is very important, however, to limit the maximum battery voltage during charging otherwise the battery will be damaged.
The battery voltage should not exceed For a AC adapter to work you will need one with the exact voltage 12V and an equal or higher current rating 1. Begin typing your search term above and press enter to search. Press ESC to cancel. Skip to content Home Physics How many amps does a alternator put out? Ben Davis December 23, How many amps does a alternator put out? How many volts should alternator put out? How do I make my alternator high output?
What should voltage be at idle? How do I check the current output of my alternator? Do alternators charge at idle? What causes low alternator output? Can you replace a bad diode in an alternator? What is a bad diode in alternator?
Can an alternator go bad from sitting? On older vehicles, the battery light would turn on the alternator light when the alternator output or battery voltage dropped below a preset value. The battery light on modern vehicles, however, is controlled by data and trouble codes. This is why a scan tool is essential to diagnosing a charging system. These codes can lead to a faster and more accurate diagnosis. Codes for the alternator can be found in the engine control module and the modules that control the distribution of power to the vehicle.
Also, most modules on a vehicle will set a code if low system voltage is detected. Advertisement Testing the Battery. The rule of thumb that states The alternator will overcharge the remaining cells and boil the electrolyte in the other cells. At the other extreme, a battery that is sulfated due to being undercharged or not seeing constant use will maintain normal charging voltages. The symptoms of a sulfated battery are that it charges very quickly and produces a very low amperage discharge rate.
Advertisement Fewer and fewer batteries allow the technician to view electrolyte levels or test individual cells. This is why testing with an electronic conductance tester that measures cold cranking amps is the most accurate way to assess the condition of the battery.
Because new batteries typically test as much as 25 percent higher than their rated capacities, a recently replaced battery with a bad cell can occasionally pass both a conductance and a load test. As a rule, the key-off current drain on most late-model vehicles should be less than 50 milliamps mA.
If a draw is depleting a battery, it can mean extra stress on the alternator and charging system. But on some vehicles, it might be normal to have ev Advertisement en greater draws for up to 10 minutes after the keys have been removed from the ignition. During this period, the serial data buses could be communicating and performing some digital housekeeping.
Also, systems like air ride, evaporative emissions systems and auxiliary water pumps could still be active long after the vehicle has been parked.
This is why in some service information for modern vehicles, an OBDII breakout box and a scan tool are necessary to solve some intermittent parasitic power drains. Many late-model vehicles use a decoupler pulley on the alternator. This prevents the belt from slipping and reduces vibration. Actively scan device characteristics for identification.
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Select basic ads. Create a personalised ads profile. Select personalised ads. Apply market research to generate audience insights. Measure content performance. Develop and improve products. List of Partners vendors. Jeremy Laukkonen. Facebook Twitter LinkedIn. Updated on November 13, Jessica Kormos. The wiring and connections attached to the alternator should be examined for looseness, corrosion or other damage.
Corroded battery terminals and cables are a common problem on many vehicles, and this corrosion may cause a discharge of voltage and should be repaired. Jay Motes is a writer who sold his first article in
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