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How many diodes in an alternator (external regulator)
Well, any educated guesses. I am looking infos on a 74 2.7CIS alternator with external regulator.
Ingo |
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08-06-2002, 02:13 PM
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I would say that for a 3 phase alternator, you need two diodes to rectify each phase for a total of 6.
Then you need 3 more for the diode trio. My opinion is 9. |
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08-06-2002, 02:27 PM
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Location: Las Vegas, NV, USA
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Haynes shows 9 diodes...
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Jordi Riera '84 930 (modified) |
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08-06-2002, 02:30 PM
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Well, 9 is what I thought until a guy at the alternator shop claimed 8. I am lost here.
He was also talking about "isolation diodes" - what the heck is that?
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1974 Targa 3.6, 2001 C4 (sold), 2019 GT3RS, 2000 ML430 I repair/rebuild Bosch CDI Boxes and Porsche Motronic DMEs Porsche "Hammer" or Porsche PST2, PIWIS III - I can help!! How about a NoBadDays DualChip for 964 or '95 993 |
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08-06-2002, 02:38 PM
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Location: TX USA
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The answer is ... it depends on the mfr and chosen design! Excitation diode array isn't needed if the regulator is designed to use the B+ supply instead! Most American-designed alternators only have the six power rectifiers -- cheaper to build and fewer parts to fail!
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Warren Hall, Jr. 1973 911S Targa ... 'Annie' 1968 340S Barracuda ... 'Rolling Thunder' |
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08-06-2002, 03:44 PM
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1974 Porsche 911 Targa 3.6
2020 BMW X3M competition
1979 Porsche 911SC
1996 Porsche 993 C4S
2003 BMW e39 M5
2005 Porsche 911 Turbo S
