Alternator, Generator, Battery

[JFP in PA]

They are working already on the subject.

What means "disconnect it from the electricel circuit" ?

Disconnect all electrical power to it by unplugging it or pulling out fuses. You want to see if it is a source of high current draw while the car is running, which is difficult without very specific instrumentation, next best thing is to kill it electrically and see what happens.

[ekstroemtj]

Thank you !

[ekstroemtj]

Got the car back from specialist. Checked everything. Result : new alternator or regulater is not working properly. Definitely !!

[Ahsai]

And the solution is?

[ekstroemtj]

The only solution is, back to the porsche shop who did the job. They are responsible for this alternator. They have to get a new one and have it tested in some way before they install it again

[Ahsai]

Sounds like good news to me :)

[ekstroemtj]

Got the car back from specialist. Checked everything. Result : new alternator or regulater is not working properly. Definitely !!

The shop did a check on many things. Difficult for me to translate this special terms. Just the numbers are maybe interesting for somebody:

Loading power at rpm 700: zero

Power drain from battery at rpm 700: 50A

Loading power at rpm 1500: 80A

Carging power Battery: 20 A

Nice weekend for everybody

[Ahsai]

Sounds like an alternator load test performed at idle and at 1500rpm. It clearly failed at idle where the alternator outputs nothing and the engine is powered only by the battery.

[ekstroemtj]

Yes yes and more and more i believe its JFP' s guess: it may not be the alternator it is maybe only the regulator. A broken alternator should not have that much output at higher rpms

[bigbuzuki]

Maybe the Porsche boys used the old regulator in the new alternator to save some money.

[ekstroemtj]

Maybe the Porsche boys used the old regulator in the new alternator to save some money.

Mmmmmmm. The old alternator i have here. Is the regulator a external part or is it inside the alternator?

[ekstroemtj]

Does anybody have a picture of a regulator or better a diagramm where this part is sitting.

[ekstroemtj]

I found a diagram. Can somebody please point

Me to the regulator.

[JFP in PA]

I found a diagram. Can somebody please point

Me to the regulator.

The regulator is internal to the alternator, you have to open it up to even see it:

[ekstroemtj]

Merci Merci

[Ahsai]

Best bet is to get another alternator (new or reman) and have it load tested BEFORE putting it on the car because there are other electronics that can also go wrong inside the alternator (e.g., power diodes).

Anyways, it's Porsche center's problem now under warranty work :)

[ekstroemtj]

I wanted to have a look inside to the old one but i dont

The right tools to open the black cover.

Ahsai you are right, it should be their problem. What i see now its a fight

Between the porsche shop and the manufacturer of the alternator

About the labor for changing this part a second time.

[Ahsai]

Its a remanufactured from Bosch. Before i took it they run a test. Output was between 13.70 and 14.5

Ok, looks like your alternator is manufactured by Delphi. I have searched and couldn't find any Bosch equivalent unit. If it's a reman, you would think it's from Delphi and not Bosch. Does the Bosch center recognize the alternator as a Bosch reman unit?

Btw, seems no parts are available for rebuild according to this thread, not even the regulator.

http://forums.rennlist.com/rennforums/porsche-cayenne-forum/774694-2004-ctt-water-cooled-alternator-r-and-r-oh-joy.html

[ekstroemtj]

Ahsai.

The pictures are showing the original alternator which they took out 2 weeks ago. Its the OEM part from the car which was running there for the last years.

Now i have a remodeld inside which is not working proper too as i described. It was reman by BOSCH according my information. If you look for a alternator for a Cayenne here in Germany, you can find Delphi, Hitachi and Bosch.

[Ahsai]

Interesting. In US here, the Bosch catalogue only lists the alternator for the v6 Cayennes. They have nothing for the v8.

Curious to find out what the Porsche center will say about Bosch's finding.

[ekstroemtj]

I thought this regulator is a plug and play part.

But as i see it must be fixed with a soldering bolt.

[Ahsai]

Most of them are but this design is different. Looks like you're right that the pins need to be desoldered in order to remove the regulator.I found the regulator for Delphi alternators 10480403 and 10480407 so not exactly your model but looks similarly designed http://www.ebay.co.uk/itm/VERG1155-12-VOLT-ALTERNATOR-REGULATOR-MERCEDES-DELPHI-DELCO-REMY-235542-/300857909741?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item460c8761ed

Looks like Mercedes and VW also use these water cooled alternators. Maybe a correct replacement regulator for yours IS available out there somewhere.

Edited May 19, 2014 by Ahsai

[Ahsai]

Here you can see the diode pack side of the two pins. Seems the pins just plug into each other but it's hard to tell whether any crimping or soldering is needed by design. I wonder if someone has been inside your alternator before and soldered those pins... Photo taken from here.

[ekstroemtj]

Mmmm. Thanks for the detailed information.

I am already dreaming from batteries and alternators. Makes me crazy:-)

Tomorrow the alternator will go back and hopefully in some days i will have a new one. Anf than pray that this problem is fixed.

[ekstroemtj]

Follow up:

The original Alternator which was in the car (the pictures i posted) went to Bosch. They wrote me today. Part is ready to install. Indead it was faulty. They changed everything inside + new regulator.

Now next try. I hope and pray