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   rec.autos.tech      Technical aspects of automobiles, et. al      117,728 messages   

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   Message 117,346 of 117,728   
   =?UTF-8?B?8J+YjiBNaWdodHkgV2FubmFiZ to Xeno   
   Re: One wire alternator question   
   13 May 23 08:11:03   
   
   From: @.   
      
   On 5/13/2023 7:45 AM, Xeno wrote:   
   > On 13/5/2023 9:24 pm, 😎 Mighty Wannabe ✅ wrote:   
   >> On 5/13/2023 7:09 AM, Xeno wrote:   
   >>> On 12/5/2023 2:08 am, Scott Dorsey wrote:   
   >>>> Xeno   wrote:   
   >>>>>   
   >>>>> Then it wouldn't be a single wire alternator, would it? Think   
   >>>>> about that   
   >>>>> for a moment. Alternators are, typically, 3 phase. That means 3 +ve   
   >>>>> power diodes, 3 -ve power diodes and 3 exciter diodes. If there is   
   >>>>> only   
   >>>>> one output wire, then all *rectification* and control has to be   
   >>>>> on-board.   
   >>>>   
   >>>> When someone says "GM 1-wire alternator" they are talking about a   
   >>>> series   
   >>>> of alternators introduced in 1970 or so, starting with the Delco   
   >>>> 10SI and   
   >>>> including some more modern follow-ons.  These alternators use internal   
   >>>> rectification and regulation (really just regulating pulses to the   
   >>>> field   
   >>>> coil) and are very, very foolproof.   
   >>>>   
   >>>> Because of this they are frequently retrofitted into older cars.  I   
   >>>> see   
   >>>> them on all sorts of older British cars as part of a conversion to a   
   >>>> modern 12V electrical system.   
   >>>>   
   >>>> There isn't much to go wrong other than having the alternator go bad.   
   >>>   
   >>> What used to happen to them back in the 70s was that heat and   
   >>> vibration would damage the regulator - even with its encapsulation.   
   >>> A separate regulator mounted on the inner guard or firewall and in   
   >>> the underhood airflow was a much better arrangement.   
   >>>   
   >>   
   >> The OP said it can charge the battery to 13.8V, can't you read?   
   >   
   > The voltage can get to 13.8 *without* pumping much current. Voltage is   
   > *pressure* whereas *current is flow*.   
   >>   
   >>>> Mind you it is possible that the original poster's problem is that   
   >>>> they   
   >>>> have a three-wire alernator or an alternator with external mechanical   
   >>>> voltage regulator and none of the other wiring is connected.   
   >>>   
   >>> Not enough detail in the OPs post to really know what's what.   
   >>   
   >> I have already provided full explanation. You are too boneheaded to   
   >> understand.   
   >   
   > You have provided proof that you haven't a clue.   
      
   You don't have the education or practical knowledge to analyze this   
   abnormal situation. You still cannot answer the question why the OP says   
   there is no apparent DC current from the alternator but it can charge   
   the battery to 13.8V when the engine is running.   
      
   I don't think you can think. Pity.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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