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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #26  
Old 07-22-2011, 11:14 AM
giskard giskard is offline
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Diodes appear to be ZR1480. There's only a few that Bosch make, and by process of elimination:

http://www.bosch-semiconductors.de/m...Summer2011.pdf
Page 32, part number ZR1480


Given the alternator is 150A, the diodes need to be rated >50A each. All the ones >50A have the same ED-10 package, so the 80A one will work even if the 65A ones are the right ones.

These guys sell em
You need 3 each of the positive and the negative:
http://www.ennisproducts.com/cfmx/pr...RODTYPE=DIODES
http://www.ennisproducts.com/cfmx/pr...RODTYPE=DIODES

Last edited by giskard; 07-25-2011 at 12:07 PM.
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  #27  
Old 07-22-2011, 01:52 PM
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bluebee bluebee is offline
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Mein Auto: 02 BMW 525i M54 auto 130K
For the record, I'll add this thread to the bestlinks since it has so many references for parts suppliers for an alternator rebuild.

Here is what is in the best links at the moment:
Rebuilt Alternator DIYs:
- Aioros 1999 Valeo Alternator rebuild DIY (1) and quest for materials (1)
- DIY for replacing the brushes in an (Audi) Valeo alternator (1)
- Cn90 rebuild of 1998 Bosch Alternator for $30 (1) (2)
- Bosch 120 amp rebuild DIY for a VW (1)
- Cn90 explanation of why you want to rebuild your own alternator (1)
- Cn90 explanation of where to get hard-to-get alternator rebuild parts (1)
- How to determine exactly what alternator you have (1)
- How to test a BMW E39 battery & alternator (1)
- How to tell from the part number if the alternator is rebuilt "by" Bosch (1)
- Bosch alternator bearing replacement from a 1997 MB S600 (1) & Range Rover (1)
- How to prevent leaves in your alternator air-intake duct (1) (2)

Maybe a keyword-rich sentence such as this one may be useful to others:

- How to test (1) & determine exactly what alternator you have (1) & why rebuilding an alternator is preferable to replacing (1) & cn90 DIYs for rebuilding a 1998 air-cooled BMW Bosch alternator (1) (2) or his VW Bosch alternator (1) & cdawg246's quest for materials for a Bosch water cooled alternator rebuild (1) & Aioros' 1999 Valeo Alternator rebuild DIY (1) and his quest for materials (1) & Cn90's explanation of where to get hard-to-get alternator rebuild parts (1) & how to tell from the part number if a replacement alternator is actually rebuilt "by" Bosch (1) & a DIY for replacing the brushes in an (Audi) Valeo alternator (1) & a Bosch alternator bearing replacement from a 1997 MB S600 (1) & from a Range Rover (1).
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  #28  
Old 07-22-2011, 03:07 PM
giskard giskard is offline
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Mein Auto: 03 540i/6 MTech, 97 M3
I called Ennis products from my above link and they didn't have them even though their webpage says they do.
I did a search for "ZR1480" and these guys' page list em, using the long part numbers also used by Ennis: 51.1980.1.1 and 51.1980.2.1

http://www.randgroupinc.com/boschdi.htm

I'll call them on Monday.
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  #29  
Old 07-22-2011, 03:09 PM
giskard giskard is offline
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Mein Auto: 03 540i/6 MTech, 97 M3
bluebee great post. Searchers need to understand that the 540i for example, use the 150A water cooled Bosch alternator which isn't the same as the air-cooled ones from the 6 cyls.

Last edited by giskard; 07-22-2011 at 10:50 PM.
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  #30  
Old 08-01-2011, 01:12 PM
giskard giskard is offline
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Mein Auto: 03 540i/6 MTech, 97 M3
Ennis have em in stock.

http://www.ennisproducts.com/cfmx/pr...RODTYPE=DIODES
(305) 463-8088

Here are the part numbers.

51.1950.1-1 (negative)
51.1950.2-1 (positive)

I ordered a bunch. We'll see how it goes.
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  #31  
Old 08-01-2011, 02:23 PM
JimLev JimLev is offline
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Cdawg, I'm pretty sure I have them, I'll have to check.
I'm on my way out the door and traveling all day tomorrow.
Shoot me an email to remind me. jimlevATcomcastDOTnet (change the AT and DOT)
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  #32  
Old 08-01-2011, 03:02 PM
Burning2nd Burning2nd is offline
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Proper dead link brotha man...
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  #33  
Old 11-15-2012, 04:56 PM
Snoboarder156 Snoboarder156 is offline
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Bosch Water cooled alternator diodes

I know this is an old post but I am having this experience for the first time and wanted to share my findings. I found a distributor that has access to all kinds of parts and keeps in stock the Bosch 50 amp diodes which currently are selling for $3.08 each. Here is there info...

Faulkner Auto Electric
1831 NW 28TH Ave, Portland, OR
(503) 227-3567

They were very helpful and are shipping the parts right to my door even though they are only 20 minutes away from me. Saves me some time and gas!

Hope this helps some with finding parts!
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  #34  
Old 11-18-2012, 08:24 PM
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cdawg246 cdawg246 is online now
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Mein Auto: 1999 540i m-sport
You need to keep this thread alive-cause its a real easy fix if u can get your hands on those diodes-my reman alternator has been working flawlessly, bought from a armenian alternator specialist in cali

Sent from my SGH-T959 using Bimmer App
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  #35  
Old 02-05-2013, 07:22 PM
avu3 avu3 is offline
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Diode Update

Ennis no longer carries Bosch, called there today.

Rand in Florida do. They're incredibly nice. (305) 463-8088 However, they are out of stock and don't expect to get more anytime soon. All the factories are shut down for Chinese New Year. He said maybe mid-March (2013). Will be trying Faulkner next.

The Diodes are "Avalanche Diodes" which means they have some sort of circuit protection built in so that when they fail, there isn't a spike which wipes out the car's sensitive electronics. Bosch did that on both the Positive and Negative side. GM apparently felt it sufficient to do that only on one side (the fellow at Rand told me which, but I forget now) of their alternators. Google/Wiki have details on Avalanche Diodes

I found on a Range Rover site that apparently there is such a thing as a "generic" version of the diode, and I found some on eBay, but given the hassle of changing the alternator and the relatively low cost of the proper part (when it can be found), I'm still hunting for the Bosch ones.

Scott
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