How to Test a Car Voltage Regulator

How to test the voltage regulator. Um, on any car. With an alternator, you have a voltage regulator and this voltage regulator is responsible for keeping the voltage on the vehicle from exceeding a limit. Uh, usually this limit is 13.8 to 14.2 volts, which is enough voltage to allow for proper battery charging, uh, but not enough to burn out light bulbs or damage delicate computer circuits. The best way to test a voltage regulator is with a multimeter. And what you do is you put your multimeter clamps directly on the battery terminals, positive red depositive and black to negative. And you said it to voltage. And with the car off you should have a little over 12 volts. That’s, that’s a healthy battery. Um, and when the, uh, once you’re hooked up, you want to start the vehicle and what you’ll see is that at idle, um, the voltage will increase

This means that the alternator is charging the battery. We’re making about, uh, 13.8 13.9 volts. And so at this point, what you want to do, what you want to slowly start increasing the speed of the engine. Um, and once you hit between 1500 and 2000 Rpm, the voltage should reach a point where it no longer increases. And what we’re noticing is that it’s maxing out right around 13.98, nine seven or so, which as well within that 13.8 to 14.2. So this voltage regulator, uh, it seems to be working fine if the voltage keeps climbing with the Rpms an up in the 15 plus volt range than the voltage regulator is not doing its job. And it needs to be replaced if the voltage is too low than the alternator is not charging properly and it needs to be rebuilt or replaced. And lastly, if the voltage with the vehicle off is below 12 volts then the battery is most likely in need of being replaced.

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