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Alternator, Generator, Battery

ekstroemtj
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ekstroemtj Member

ekstroemtj

Posted
Posted

I should ask for a special corner in this forum "thomas and his problems"

There is no month quiet driving with my cars.

Always something else.

Anyway, i will just explain it in a short way.

The Turbo which i have now for some weeks was driving almost perfect since i got the car some weeks ago.

I just replaced the battery because the car didnt start always on the first attempt.

Today i drove to gas station. From one minute to next idle went up to arround 800to 1000 and on the display the battery sign appears.

Followed by the information: vehikel shutting down electronic devices.

After i couldnt start. I waited a minute and car runs normal. After some minutes again idle up to 1000 and

The battery symbol on the display.

Does it mean my alternator said good by or is it something more serious?

Thank you

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JFP in PA Member

JFP in PA

Posted
  • Moderators
Posted

I should ask for a special corner in this forum "thomas and his problems"

There is no month quiet driving with my cars.

Always something else.

Anyway, i will just explain it in a short way.

The Turbo which i have now for some weeks was driving almost perfect since i got the car some weeks ago.

I just replaced the battery because the car didnt start always on the first attempt.

Today i drove to gas station. From one minute to next idle went up to arround 800to 1000 and on the display the battery sign appears.

Followed by the information: vehikel shutting down electronic devices.

After i couldnt start. I waited a minute and car runs normal. After some minutes again idle up to 1000 and

The battery symbol on the display.

Does it mean my alternator said good by or is it something more serious?

Thank you

You need to have the alternator checked for out put, it may be as simple as a bad voltage regulator.

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JFP in PA Member

JFP in PA

Posted
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Thankx a lot. Will check it.

If i am right the voltage regulator is a part of the alternator?

It is, but it is also removable and replaceable without getting a new alternator.

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JFP in PA Member

JFP in PA

Posted
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Posted

Last question please. Will durametic or piwis find this failure or it has to be tested in a different way?

Yes, but you can also do it with a simple hand held volt meter.

ekstroemtj Member

ekstroemtj

Posted
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JFP...

According our conversation i was talking to BOSCH today. I thought cars electric system is their main business and they should know what to do. I explained the situation and the guy made me feel affraid. He told me " if you have a bad alternator regulator it could cause serious damage on the cars electric system because of high voltage spikes. Better dont drive anymore even some meters. Disconnect the battery too because it could be completely discharged and broken. Best way to tow the car to the next service station"

He was very serious. Could he be right?

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JFP in PA Member

JFP in PA

Posted
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Posted

JFP...

According our conversation i was talking to BOSCH today. I thought cars electric system is their main business and they should know what to do. I explained the situation and the guy made me feel affraid. He told me " if you have a bad alternator regulator it could cause serious damage on the cars electric system because of high voltage spikes. Better dont drive anymore even some meters. Disconnect the battery too because it could be completely discharged and broken. Best way to tow the car to the next service station"

He was very serious. Could he be right?

If the system shorted internally, yes, what he describing could occur, but these incidents are rare. But I don't think that is your problem, which is most likely low voltage related. In either case, if you connected a voltmeter directly to the battery terminals (depending upon your model, you may have more than one battery), with the vehicle off you should see 12.6V; with the vehicle running, you should see between 13.6 and 14.5V.

ekstroemtj Member

ekstroemtj

Posted
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Thanks again.

Its a turbo s with 500 hp with just one battery under the driver seat.

If i am testing the voltage according your information, what i have to learn from the numbers? If the voltmeter is showing the numbers you mentioned? Sorry for the stupid question.

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JFP in PA Member

JFP in PA

Posted
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Posted

Thanks again.

Its a turbo s with 500 hp with just one battery under the driver seat.

If i am testing the voltage according your information, what i have to learn from the numbers? If the voltmeter is showing the numbers you mentioned? Sorry for the stupid question.

If the battery is below 12.6V, the battery is at least low and needs a recharge, or may need replacing. If the alternator is below 13.6 to 14.5V, the alternator or voltage regulator are bad.

Hilux2400 Member

Hilux2400

Posted
Posted

Just a warning. Do not disconnect the battery when the engine is running. If you do this the alternator output could damage the other electrical components in the vehicle. The battery provides resistance in the circuit and if it disconnected when the car is running alternator voltage could spike.

ekstroemtj Member

ekstroemtj

Posted
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Here i am again. The car stay for some days and now nothing is working. Dead. I had to use my other cayenne to start the turbo via cable. Car started without problem. After i used the multimeter i bought to messure the voltage. Looks like the alternator us ok. The multimeter is showing same numbers on the turbo like in the s. So as i understand it cant be the alternator.

Tomorrow u will change the batterie. I will see what will happen after.

What i am wondering about it the following subject.

The car is locked. Lights switch off. But the dash is fully iluminated.

What the ...... Is this?

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RFM Member

RFM

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Why would you replace the battery if you have found the reason for the power drain already, the dash! It seems to my better to tackle this problem first.

ekstroemtj Member

ekstroemtj

Posted
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Hello to Belgium.

The battery is totaly down and i thought might be better to replace. I have one at home.

The display problem occured just AFTER i did thid jump start. So i believe thats not the original problem.

Thank you

ekstroemtj Member

ekstroemtj

Posted
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I would like to try first to take out the fuse for the dash allumination if there is one. According my om it should be number 40. somebody can confirm this

ekstroemtj Member

ekstroemtj

Posted
  • Author
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I changed the batterie for a new one. Starting normal. But after some minutes of running car starts to rev a little bit higher at 1000 and some time later batterie sign in display appears. I connect the multimeter to + and - in the engine bay. This is showing 13.8 / 14.00

ekstroemtj Member

ekstroemtj

Posted
  • Author
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Second round . Now the multimeter shows ZERO.

So for me it looks like the alternator is not working proper.

Now my question. How far is it possible to drive with a fully loaded battery and a faulty alternator?

Porsche Service is about 20 km away. Can i drive there?

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JFP in PA Member

JFP in PA

Posted
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Posted

Second round . Now the multimeter shows ZERO.

So for me it looks like the alternator is not working proper.

Now my question. How far is it possible to drive with a fully loaded battery and a faulty alternator?

Porsche Service is about 20 km away. Can i drive there?

Totally depends upon what is wrong with the alternator.

ekstroemtj Member

ekstroemtj

Posted
  • Author
Posted

Last question please about this subject.

The car allways is cranking slowly. Even today with a new high power batterie. Is this also alternator related or different subject?

I read many times that these kind of behaviour could be related to alternator batterie cable issue. Could it be possible?

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JFP in PA Member

JFP in PA

Posted
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Posted

Last question please about this subject.

The car allways is cranking slowly. Even today with a new high power batterie. Is this also alternator related or different subject?

I read many times that these kind of behaviour could be related to alternator batterie cable issue. Could it be possible?

Most definitely, when corrosion starts in the cables (particularly in the cable ends), the resistance can go way up and everything in the electrical system (battery, alternator, starter) can suffer as a result. You should have the cables checked for voltage drop across them to check their condition.

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