Alternator Voltage - Alfa Romeo Forum
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(Post Link) post #1 of 5 Old 17-10-09 Thread Starter
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Alternator Voltage

Hi does anybody know if a voltage on the battery with engine running of 14.05v is alright?
I have an Alfa 147 and I just replaced a battery. While I did that I checked the battery voltage with the engine running. I found out to be 14.05v
Souldn't I get 14.5v? that's what i found on the net and one of my friends car when we checked.
I tried to put everything on too and still had the same output, tried to rev the engine and still same output. Shouldn't the volage go up by 0.3 to 0.5 of a volt when revving up?
I just would like to know if I should start getting ready for an alternator change or is it perfectly fine to have just 14.05v charging the battery?
thanks for your time

Last edited by marcodigio; 17-10-09 at 18:38.
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put some loads on engine ie heated rear screen and headlights and checkreadings, prob drop a volt maybe but 14 volts look good
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As long as your voltage is over 13.5 vlots i wouldnt worry. If your putting things on and the voltage isnt dropping, then your alternator is doing what it should.

Hope this helps.

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(Post Link) post #4 of 5 Old 17-10-09 Thread Starter
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thanks guys, been spending too much money lately on my Alfa. It's good to hear I don't need a new alternator

Earlier I have tried to put on the full beam hadlights, tomorrow I will try to put on the heated rear screen as well and see what I get.
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It sounds fine. Alternators are used now as they produce high current under low revs, as the older system the dynamo was really heavy and worked better on high revs.
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alternator , voltage

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