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Alternator worries

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srhutch
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Alternator worries

Post by srhutch » Thu Jul 12, 2018 9:22 pm

dannytheduck1985 wrote: Thu Jul 12, 2018 8:57 pm If you get stuck, whip the alternator off and ship it to me. I’ll get it sorted
From Australia?
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Alternator worries

Post by dannytheduck1985 » Thu Jul 12, 2018 9:33 pm

srhutch wrote: Thu Jul 12, 2018 9:22 pm
dannytheduck1985 wrote: Thu Jul 12, 2018 8:57 pm If you get stuck, whip the alternator off and ship it to me. I’ll get it sorted
From Australia?
Australia :D

Come on man your on my page. Anything is possible. Sending a part the other side of the world sounds costly but to get it back working.......... priceless :wink:

Could end up paying double the cost with hit and miss idiots (we know I’ve encountered them)
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Alternator worries

Post by Mangozac » Thu Jul 12, 2018 9:41 pm

dannytheduck1985 wrote: Thu Jul 12, 2018 9:33 pm
srhutch wrote: Thu Jul 12, 2018 9:22 pm
dannytheduck1985 wrote: Thu Jul 12, 2018 8:57 pm If you get stuck, whip the alternator off and ship it to me. I’ll get it sorted
From Australia?
Australia :D

Come on man your on my page. Anything is possible. Sending a part the other side of the world sounds costly but to get it back working.......... priceless :wink:

Could end up paying double the cost with hit and miss idiots (we know I’ve encountered them)
Hahaha thanks for the offer mate but at this stage it still seems to be 99.9% functional so I'm not quite ready to start physical diagnostics ;)

I'll eventually pull the back off it and see if I can ID the regulator module...
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Alternator worries

Post by Mangozac » Sun Nov 25, 2018 10:23 am

Following up on this:

My battery light on the dash is coming on very frequently now, even when it's warm. The concerning thing is that when the indicator light turns off it seems to coincide with some kind of electrical event which causes the entertainment system to reboot. Not ideal!

So I pulled the alternator and prised the back cover off to see the regulator. It's nothing like either of the regulator modules alluded to in my first post and is actually a Valeo 2542604. These can be found for feasible prices.

While I had it off I checked over the rest of the alternator. The brushes are still fine. The slip rings are appropriately worn for 100k KMs of service bit still plenty of life left in them. The shaft has no movement axially or radially and spins very freely, however it does make a very slight ticking noise. Diodes all checked out OK.

So at this stage I'm still thinking it's an issue with the regulator module - that's all the DME is still reporting. Thus I need to decide whether to just replace the regulator module or get a whole new alternator. I'd really rather not the cost of the latter....
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Alternator worries

Post by ph001 » Mon Nov 26, 2018 12:38 pm

I'd just replace the regulator pack!
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Post by Mangozac » Mon Dec 03, 2018 9:35 pm

Another small update: I have ordered a replacement regulator as they can be had for not that much money compared to a new alternator. For reference, the Z4M alternator is Valeo part number TG15C098 and the voltage regulator is Valeo part number 593873. This is different to the number stamped on the regulator itself.
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Alternator worries

Post by 53Fatman » Sat Dec 15, 2018 4:11 pm

Did you change your regulator yet? If you have done it, any other things than fixing the charge problem, like another behavior in driving?

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Post by Mangozac » Sat Dec 15, 2018 8:40 pm

53Fatman wrote: Sat Dec 15, 2018 4:11 pm Did you change your regulator yet? If you have done it, any other things than fixing the charge problem, like another behavior in driving?
No, I haven't done it yet - the part is coming from the US. I'll update this thread when I do :thumbsup:
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Alternator worries

Post by Mangozac » Mon Dec 24, 2018 8:42 pm

Just a quick comment to say that the replacement regulator arrived and has been fitted. The fault has been rectified; no more light on the dash and no more fault code in the DME! Great result and much cheaper than a new alternator!
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Alternator worries

Post by Mr Tidy » Mon Dec 24, 2018 8:53 pm

That's great news OP. :thumbsup:
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Alternator worries

Post by Nev » Tue Jul 04, 2023 12:07 pm

Really useful thread, thanks to the OP for posting the part numbers :thumbsup: I’ve just ordered myself a new voltage regulator hoping it’ll sort a 005DF7 fault code Carly has picked up.

I’ve had various DSC faults light up for a split second after already replacing a rear wheel speed sensor. I’m now down to to just the one fault code mentioned above. Found one from Valeo (eBay) for £48.
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Alternator worries

Post by Boyg » Sun Jul 09, 2023 12:57 pm

Mangozac wrote: Tue Jul 03, 2018 10:09 pm Both good suggestions so I will give them a try also.

My concern is that if I do diagnose it to be a fault with the regulator that the regulator is not listed as a separate part for the Z4M. Only the complete alternator/regulator assembly. I'm trying to see if I can find any info from Bosch as to the regulator used inside the Z4M unit..

Update:
I gave the belt a visual this morning and its condition still looks very good. The battery indicator light didn't come on this morning but I checked the alternator output after startup and it was a very healthy 14.6V. Voltage drop between the alternator body and the jump start earth contact was only 50mV.
I have replaced the regulator on the Z4M last week, my symptom was overcharge to 17V in a warm afternoon but it never happen again...but to place safe before going track day I have it replaced. Fyi it is a Valeo product, fit perfectly.

Valeo Alternator Regulator
Article number: 593873

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