₦airaland Forum

Many years ago, you could disconnect a battery cable while the engine was running to test the alternator in your car. If the engine continued to run, that proved the alternator was working. But it’s a test you should never try on a modern car because they are equipped with computers and electronics. Disconnecting a battery cable while the engine is running causes the alternator to spike a 25-125-volt surge within 40 milliseconds after cable removal. That voltage spike can’t damage anything in an old non-computerized car, but it can instantly fry the many computers and expensive electronics used on all modern cars. Repairing the damage can cost a small fortune.

Please follow the link below to read more:
https://www.spotdem.com/2019/10/11/never-disconnect-a-battery-cable-to-test-the-alternator/

What if your alternator is still charging at 14.0 at idle and even moves upto 14.1 during drives? And there are no codes for the BCM, Battery or Alternator stored in the car's computer yet?

And yet, you have "Battery convenience functions" error malfunction on your dash, while your 100 amps main battery is fully charged at 12.4v and same for the Auxiliary Battery 12V 1.2Ah. Relays are in good shape and all? Do you wait for the alternator to fail completely or you'd simply start up the car, yank the wires off the main battery and watch the malfunction screen sing alternator blues accompanied by a red battery icon

Sometimes the kazeem hard way is the only way my friend.

Or you could simply get a multimeter and test the alternator output while engine is running

When you mean modern cars.. from what year are you referring to?

Mostly post millennia cars-Cars after year 2000 or a little earlier

inas911:
When you mean modern cars.. from what year are you referring to?

perfectbuy:
Many years ago, you could disconnect a battery cable while the engine was running to test the alternator in your car. If the engine continued to run, that proved the alternator was working. But it’s a test you should never try on a modern car because they are equipped with computers and electronics. Disconnecting a battery cable while the engine is running causes the alternator to spike a 25-125-volt surge within 40 milliseconds after cable removal. That voltage spike can’t damage anything in an old non-computerized car, but it can instantly fry the many computers and expensive electronics used on all modern cars. Repairing the damage can cost a small fortune.

Please follow the link below to read more:
https://www.spotdem.com/2019/10/11/never-disconnect-a-battery-cable-to-test-the-alternator/

this BS an atlernater is self regulated unless it fails