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Monsterlime

Battery And Alternator. Which alternator?

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I went out this morning (car started fine) intending a pretty long drive, stopped of for petrol about an hour in in Perth, car wouldn't re-start.  Just clicked so was pretty sure it was the battery, AA turned up and jumped the car first time, no issue.  Headed home (not taking any chances), on the way home the ABS and Battery lights came on on the dash, and the car was quite hesitant and felt down on power.  Googling has indicated that it is probably the alternator, which is what I suspected at the time.

I've ordered a replacement battery just in case, but was wondering which alternator would be the best out of these 2 - 

https://www.eurocarparts.com/ecp/c/Porsche_Boxster_3.2_2000/p/car-parts/electrical/car-electrics-and-car-lighting/alternator/?401330162&1&2620d75a2ed06d838158979620256e038cde9109&000012

https://www.porscheshop.co.uk/porsche-mechanical-parts/porsche-boxster-986-mechanical-parts-1997-to-2004/porsche-boxster-986-starters-alternators-1997-to-2004/alternator-996-997-boxster-with-slip-pulley.html

Eurocarparts, with discount code is £55 less, so if it will do the job fine, I don't really see the need to pay more!  Seems like a relatively simple job as well, even on the Boxster.

Thanks!

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AA would have ...

Checked for 14V approx once car was restarted

Used induction ampere meter to measure current drain

and advised if the alternator wasn't charding the battery.

My guess is your battery is not holding charge and needs replacing,which is what your about to do anyway.

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See how it goes with the new battery first.

No idea if RTX are any good. Porsche Shop could do with adding more details on their alternator, like who it's made by for a start.

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Alternators can be rebuilt and often it is a voltage regulator that is at fault. Nothing special about the Porsche part that you have to go to a P-car specialist. Any auto-electrical shop can do.

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Indeed. I asked at my local auto electrics shop last year. From memory they said about £50 if I removed the alternator myself. I think they said it was probably a Bosch so they would have all the necessary spares.

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I fitted an RTX one about 3 months ago as my alternator bearings were shot, it's been fine.  When I can be bothered, am going to replace the bearings on the old one and keep it as a spare.

Was easy to replace, the leads on the back of the alternator were a little fiddly but that's it.

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I fitted the new battery tonight, the car fired straight up but the 2 warning lights (ABS and Battery) were still lit.  Do I need to clear the error codes, let it run for a while, give it a drive or is it likely the alternator?

For now, I've left the car plugged in to my trickle charger and will check it and the terminals tomorrow (I actually totally forgot to check the voltage across the terminals).

Thanks!

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12 hours ago, Monsterlime said:

I fitted the new battery tonight, the car fired straight up but the 2 warning lights (ABS and Battery) were still lit.  Do I need to clear the error codes, let it run for a while, give it a drive or is it likely the alternator?

For now, I've left the car plugged in to my trickle charger and will check it and the terminals tomorrow (I actually totally forgot to check the voltage across the terminals).

Thanks!

Take it for a short drive the lights should clear after a short while. 

 

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The battery light should clear straight away, so I suspect the alternator is iffy. Trying revving the engine to see if that turns off the battery light too. The ABS light may need a restart to clear or a diag tool to clear them depending on the fault flagged.

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The alternator itself is seldom to  blame - it's usually the voltage regulator, which is less than £30 for a genuine Bosch item. Takes a few minutes to replace if the alternator is on a bench.

https://www.ebay.co.uk/itm/BOSCH-EL-FIELD-REGULATOR-F00M144136/232282559745?epid=1537666502&hash=item36151e9501%3Ag%3AuWcAAOSwax5Yx94C&_sacat=0&_nkw=F00M144136&_from=R40&rt=nc&_trksid=m570.l1313

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When mine went, westlancsautoelectrics.co.uk were recommended on here, speedy service and an 18 month guarantee, cost me for £140

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Well, we have our answer!  Tested voltage on the old battery - 11.40(ish), new battery - 12.30(ish).  New battery with car running - 12.30.

Since the voltage regulator is much cheaper, and I need to take the alternator off anyway, I may as well give that a try first.  Thank you for the link!

I assume it is worth changing the belt at the same time?

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