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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / July 2007

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Color Coded Alternator Wires

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forgetful - 29 Jul 2007 23:58 GMT
Old dodge 318 70's vintage. Replacing alternator; stupid me forgot to
write down the wire layout. There's two small wires one green and one
red each going to two different terminals, but I can't remember which
goes to which terminal. Terminals viewing from back of alternator are at
2 oclock and 11 oclock positions. Where does the red go; where does
the green go?

Thanks for any help.
aarcuda69062 - 30 Jul 2007 00:20 GMT
> Old dodge 318 70's vintage. Replacing alternator; stupid me forgot to
> write down the wire layout. There's two small wires one green and one
[quoted text clipped - 4 lines]
>
> Thanks for any help.

The small gauge wires, doesn't matter, they're field wires and
the field is totally isolated.
alfred - 30 Jul 2007 01:33 GMT
>> Old dodge 318 70's vintage. Replacing alternator; stupid me forgot to
>> write down the wire layout. There's two small wires one green and one
[quoted text clipped - 7 lines]
> The small gauge wires, doesn't matter, they're field wires and
> the field is totally isolated.

Ahh, if that is true, why are they color coded?
aarcuda69062 - 30 Jul 2007 12:34 GMT
> >> Old dodge 318 70's vintage. Replacing alternator; stupid me forgot to
> >> write down the wire layout. There's two small wires one green and one
[quoted text clipped - 9 lines]
>
> Ahh, if that is true, why are they color coded?

Because they are different circuits with different functions.
forgetful - 30 Jul 2007 23:04 GMT
>> >> Old dodge 318 70's vintage. Replacing alternator; stupid me forgot
>> >> to write down the wire layout. There's two small wires one green
[quoted text clipped - 11 lines]
>
> Because they are different circuits with different functions.

Your reply does not make any sense. If they go to different circuits,
then there is a reason and a proper terminal for each color coded wire.
Anyone here know the answer to my original question??
Comboverfish - 30 Jul 2007 23:22 GMT
> > In article <f8jbkv$97...@aioe.org>, alfred <alfred_...@aol.com>
> > wrote:
[quoted text clipped - 22 lines]
>
> - Show quoted text -

You don't know enough to know the correct answer has already hit you
in the a.s at least two times.  Now how about an apology for replying
like a dipshit (referring to previous reply to Steve)?

Here's a parallel... If you had a question about wiring a simple light
switch in a one switch/one load house wiring arrangement, there is no
functional difference which wire goes where.  Sure, one wire is the
source hot and the other is the load, but it makes no difference which
way you attach them.  In this parallel you see the answer (makes no
difference) -and- the explanation (one is hot, the other is load).
Seems quite a bit like the thread here.

Toyota MDT in MO
forgetful - 31 Jul 2007 00:39 GMT
>> > In article <f8jbkv$97...@aioe.org>, alfred <alfred_...@aol.com>
>> > wrote:
[quoted text clipped - 35 lines]
> difference) -and- the explanation (one is hot, the other is load).
> Seems quite a bit like the thread here.

ok, but if the light in the house has a hot lead connected to it's
ground and the fixture is grounded it will short out. It is a bad idea
to connect a hot lead to the lead where the ground should be. Also, I
seriously doubt that Dodge would go to the trouble of color coding the
alternator wires if there was not a specific terminal they should be
connected to. Also there is something called polarization of the
alternator. I am not certain how this figures in, but the answer that it
does not matter simply does not pass the test of common sense. repeat
there is NO blue wire, only red and green. Now does anyone in this
expert group know the answer?

> Toyota MDT in MO
aarcuda69062 - 31 Jul 2007 02:45 GMT
> >> > In article <f8jbkv$97...@aioe.org>, alfred <alfred_...@aol.com>
> >> > wrote:
[quoted text clipped - 39 lines]
> ground and the fixture is grounded it will short out. It is a bad idea
> to connect a hot lead to the lead where the ground should be.

Does the light bulb care whether hot is connected to the center
contact versus the threaded shell?

> Also, I
> seriously doubt that Dodge would go to the trouble of color coding the
> alternator wires if there was not a specific terminal they should be
> connected to.

You'd have a point if which terminal were the reason for the
color coding of the wire.
Were it an issue, ChryCo would have made the terminals so they
couldn't be interchanged.

> Also there is something called polarization of the
> alternator.

No there isn't.

> I am not certain how this figures in,

It doesn't unless you fibbed and this isn't a 70s alternator to
begin with.

> but the answer that it
> does not matter simply does not pass the test of common sense.

It does if (as I said) the field circuit is totally isolated.

> repeat
> there is NO blue wire, only red and green. Now does anyone in this
> expert group know the answer?

The answer is; there are three wires that connect a 70s vintage
ChryCo alternator.  Wanna start over?
Comboverfish - 31 Jul 2007 06:24 GMT
> >> > In article <f8jbkv$97...@aioe.org>, alfred <alfred_...@aol.com>
> >> > wrote:
[quoted text clipped - 46 lines]
> there is NO blue wire, only red and green. Now does anyone in this
> expert group know the answer?

My parallel wasn't perfect, but you are going way off tangent with
it.  Why don't you try hooking one of your mystery wires (might I
suggest the B+ wire) to the chassis or engine block and see where it
gets you.   That's as lame as hooking a black hot wire to neutral or
ground.  I made a comparison to having a spst switch and two wires
made to go to the two terminals on the switch.  You can't f.ck that up
unless you go outside the implied constraints of the argument.
Similarly, you can't f.ck up your "70's era Chryco alternator" field
wires by going out of the constraints of what you were told will
work.  You were also told by several people that one wire is B+ and
the other is regulated ground from the remote regulator assly.  If you
have a voltmeter, test light, RC car motor, or a tongue you should be
able to figure out which is which from that info.

Toyota MDT in MO
Steve - 31 Jul 2007 18:07 GMT
>>>>In article <f8jbkv$97...@aioe.org>, alfred <alfred_...@aol.com>
>>>>wrote:
[quoted text clipped - 42 lines]
> alternator wires if there was not a specific terminal they should be
> connected to.

Listen carefully. At the ALTERNATOR, it doesn't matter which wire goes
where. But the OTHER end of one of the wires needs to go to the
top-center pin on the voltage regulator, and the OTHER end of the OTHER
wire needs to go to the outboard pin on the voltage regulator. Both
wires are part of the engine wiring harness. Would you have Mopar splice
wires so that both wires are (pick a color) on the alternator end but
coded correctly on the VR end? Are you really that dense?
aarcuda69062 - 31 Jul 2007 02:30 GMT
> >> >> Old dodge 318 70's vintage. Replacing alternator; stupid me forgot
> >> >> to write down the wire layout. There's two small wires one green
[quoted text clipped - 13 lines]
>
> Your reply does not make any sense.

Because you do not understand how the alternator field circuit
functions.

> If they go to different circuits,
> then there is a reason and a proper terminal for each color coded wire.

Not in this case.
One wire  supplies ignition on 12 volts to the stator.
The other wire is toggled to ground via the voltage regulator.
Matters not which spade terminal you connect them to.
This is without a doubt, the simplest field circuit ever devised,
don't make it more complicated.

> Anyone here know the answer to my original question??

I gave it.
If you're having problems it's because you omitted or made errors
in your original post.
Steve - 30 Jul 2007 18:26 GMT
>>>Old dodge 318 70's vintage. Replacing alternator; stupid me forgot to
>>>write down the wire layout. There's two small wires one green and one
[quoted text clipped - 9 lines]
>
> Ahh, if that is true, why are they color coded?

Because the OTHER end of where those wires connect does matter. ;-)

The blue one goes to switched 12v power, the green one goes to the
controlled pin on the voltage regulator.
cuhulin@webtv.net - 30 Jul 2007 18:54 GMT
Some of them rebuilt alternators (especially from Autozone) the case
halves are not lined up correctly.So far though, I have had pretty good
luck with Autozone parts.
cuhulin
Steve - 30 Jul 2007 22:32 GMT
> Some of them rebuilt alternators (especially from Autozone) the case
> halves are not lined up correctly.So far though, I have had pretty good
> luck with Autozone parts.
> cuhulin

That makes one of you :-/
aarcuda69062 - 30 Jul 2007 19:07 GMT
> >>>Old dodge 318 70's vintage. Replacing alternator; stupid me forgot to
> >>>write down the wire layout. There's two small wires one green and one
[quoted text clipped - 14 lines]
> The blue one goes to switched 12v power, the green one goes to the
> controlled pin on the voltage regulator.

Some days, it just isn't worth chewing thru the restraints...
Steve - 30 Jul 2007 22:34 GMT
>>>Ahh, if that is true, why are they color coded?
>>
[quoted text clipped - 4 lines]
>
> Some days, it just isn't worth chewing thru the restraints...

So, the nice guys in the white padded panel van finally caught up to
you? :-p  They're still looking for me ;-)
forgetful - 30 Jul 2007 23:02 GMT
>>>>Old dodge 318 70's vintage. Replacing alternator; stupid me forgot
>>>>to write down the wire layout. There's two small wires one green and
[quoted text clipped - 11 lines]
>
> Because the OTHER end of where those wires connect does matter. ;-)

Try to repost when you learn to read maybe? No mention of blue wire,
there is red and green, as OP says.

> The blue one goes to switched 12v power, the green one goes to the
> controlled pin on the voltage regulator.
Steve - 31 Jul 2007 18:04 GMT
>>>Ahh, if that is true, why are they color coded?
>>
>>Because the OTHER end of where those wires connect does matter. ;-)
>
> Try to repost when you learn to read maybe? No mention of blue wire,
> there is red and green, as OP says.

Try to repost when you're sober. 70s Mopar alternator field wires are
BLUE and GREEN, at least from the factory. His may be red, but if so its
been re-wired. And the point is that at least at the alternator end, it
DOES NOT MATTER which one goes on which spade terminal.
cuhulin@webtv.net - 30 Jul 2007 15:13 GMT
I hear ya! About seven years ago, I replaced the alternator (with a
rebuilt Autozone alternator) on my 1978 Dodge van.I had forgotten to
take special note of which wire went where.When I finally figured it
out, I drew a diagram on a piece of cardboard and I put the diagram in
the glove compartment of my van.Anyway, next time I need to replace the
alternator, I will put a little piece of masking tape on the wires and
mark the tape with a ball point pen and also refer to my homemade
diagram.

Thing is though, always use some masking tape on any wires that you
aren't absolutely sure about where they go.
cuhulin
dahpater - 31 Jul 2007 03:58 GMT
> Old dodge 318 70's vintage. Replacing alternator; stupid me forgot to
> write down the wire layout. There's two small wires one green and one
[quoted text clipped - 4 lines]
>
> Thanks for any help.

http://www.autozone.com/az/cds/en_us/0900823d/80/17/60/8f/0900823d8017608f/repai
rInfoPages.htm


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