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Author Topic: Alternators 1 Wire or 3 Wire ( That is the question!)  (Read 394 times)

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fabr

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Alternators 1 Wire or 3 Wire ( That is the question!)
« on: July 24, 2016, 09:09:21 PM »
Welllll,it's a long read but welllllll worth the effort. 

http://www.madelectrical.com/electricaltech/onewire-threewire.shtml


 I am finishing up wiring the car and when it came time to run the alternator circuit I find myself in a quandry. I'm using a 1 wire , alternator field break type of battery disconnect (4 terminal)switch. I'm hit with the reality that the alternator being a 1 wire is not going to have a field wire to tap into.  Well,fook,that doesn't address the need to open the field wire circuit to stop alternator output before battery disconnect in an emergency situation allowing the alternator to back feed the electrical system which would allow the engine to continue running. Hooking up the alternator battery charge wire to the terminals doesn't do a damn thing to prevent back feeding and it will be carrying a lot more amps than the small terminals circuit can handle anyway.

Oh well,after reading the above,I now understand the practical differences in performance of a 1 wire vs 3 wire alternator. I'm very glad I learned a lot today. The 1 wire polished alternator is going to my buddy,the electrical motor rebuilder tomorrow to be returned to a 3 wire unit. Never a wasted day when I learn something ,actually quite beneficial.
« Last Edit: July 24, 2016, 09:35:23 PM by fabr »
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BDKW1

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Re: Alternators 1 Wire or 3 Wire ( That is the question!)
« Reply #1 on: July 25, 2016, 09:52:44 PM »
Run the trigger wire with a relay, prevents back feeding and run on.
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fabr

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Re: Alternators 1 Wire or 3 Wire ( That is the question!)
« Reply #2 on: July 25, 2016, 10:03:44 PM »
My understanding is that that is done but may not actually serve the purpose since that would only effectively cut the field/trigger at the same time as the battery cut and could still allow run on/backfeeding.
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
"I fear the day that technology will surpass our human interaction. The world will have a generation of idiots" Albert Einstein  (IT'S OFFICIAL THAT DAY IS HERE NOW!)

dsrace

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Re: Alternators 1 Wire or 3 Wire ( That is the question!)
« Reply #3 on: July 26, 2016, 05:10:24 PM »
well i think the article states the best case to go to the 3 wire!
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fabr

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Re: Alternators 1 Wire or 3 Wire ( That is the question!)
« Reply #4 on: July 26, 2016, 09:26:59 PM »
The ability to remotely sense voltage so the alternator delivers full power to the main junction is the best benefit.
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
"I fear the day that technology will surpass our human interaction. The world will have a generation of idiots" Albert Einstein  (IT'S OFFICIAL THAT DAY IS HERE NOW!)

fabr

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Re: Alternators 1 Wire or 3 Wire ( That is the question!)
« Reply #5 on: July 27, 2016, 07:47:24 AM »
I should add that not all alternators voltage regulators have access to the field wire.  All ,SFAIK,have the s terminal allowing remote voltage sensing.
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
"I fear the day that technology will surpass our human interaction. The world will have a generation of idiots" Albert Einstein  (IT'S OFFICIAL THAT DAY IS HERE NOW!)

budlight69

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Re: Alternators 1 Wire or 3 Wire ( That is the question!)
« Reply #6 on: July 27, 2016, 03:09:57 PM »
Well I finally got the article read.  Interesting, never thought it out that deep.  But just by luck, my buggy is wired the correct way.  My last VW buggy wouldn't shut off because the alt wire back fed the coil thru the idiot light.  A diode fixed that issue. 

Do you have an estimated date for firing the buggy up? 
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fabr

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Re: Alternators 1 Wire or 3 Wire ( That is the question!)
« Reply #7 on: July 27, 2016, 05:06:11 PM »
Not really,all the fuel line pieces will be here hopefully Fri/Mon.. Hoping for it to be/should be within 2 weeks.
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
"I fear the day that technology will surpass our human interaction. The world will have a generation of idiots" Albert Einstein  (IT'S OFFICIAL THAT DAY IS HERE NOW!)
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