Alternator Voltage Output

[apdhillon]

I have a 24 volt electric system in my ’84 BJ42 with the 3B 3.4 4 cyl engine. My alternator was not working. I had it remanufactured by a local shop.

How much should the voltage output be if the alternator is working 100% effectively?

 

[lostmarbles]

I have a 24 volt electric system in my ’84 BJ42 with the 3B 3.4 4 cyl engine. My alternator was not working. I had it remanufactured by a local shop.

How much should the voltage output be if the alternator is working 100% effectively?

You should measure around 28/29 volts at your battery.

Exactly how much you measure depends a lot on whether your battery charge is low or fully-charged. Even then it varies with the condition of the battery and on what electrical loads you have running. (In other words, output voltage alone can't tell you if your alternator working 100%.)

 

[bj40green]

You should measure around 28/29 volts at your battery.

Exactly how much you measure depends a lot on whether your battery charge is low or fully-charged. Even then it varies with the condition of the battery and on what electrical loads you have running. (In other words, output voltage alone can't tell you if your alternator working 100%.)

x2 on lostmarbles's answer.
You can do a very basic check;
Let the engine run a little above idle and switch on your headlights and some other users. The voltage should be between 24 and 28V but not less then 24V.