Searching \ for 'Turning off car alternator' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: www.piclist.com/techref/index.htm?key=turning+off+car
Search entire site for: 'Turning off car alternator'.

Truncated match.
PICList Thread
'Turning off car alternator'
1998\08\07@204036 by john pearson

flavicon
face
I have a Ford 2 wire alternator. Can I turn it off, at idle, so that it will
'freewheel', not charge the battery and not load down the motor? If so,
would it hurt to turn it back on again after about 30 seconds while at idle?
I would do this through the regulator, wouldn't I?
Thank you
John

1998\08\07@223906 by Format

flavicon
face
You could if you wanted to
Just disconnect the hot (most likely red, not blue or black) wire, and hook up a
switch.

john pearson wrote:

> I have a Ford 2 wire alternator. Can I turn it off, at idle, so that it will
> 'freewheel', not charge the battery and not load down the motor? If so,
> would it hurt to turn it back on again after about 30 seconds while at idle?
> I would do this through the regulator, wouldn't I?
> Thank you
> John



--
<------------------------------------------------------->
< Martin Klingensmith, AKA Format.                      >
< Pyrotechnics - Mountain Bikes - Electronics - Coding  >
< Aquaria - Computers - Computer Selling - And the list >
< Keeps going, and going...                             >
<------------------------------------------------------->

1998\08\08@001505 by Mike Keitz

picon face
On Fri, 7 Aug 1998 22:27:04 -0400 Format <spam_OUTmartinTakeThisOuTspamIMCNET.NET> writes:
>You could if you wanted to
>Just disconnect the hot (most likely red, not blue or black) wire, and
>hook up a
>switch.

In nearly all cars there is a circuit from the ignition switch to the
alternator - regulator package, to keep the alternator circuit from
draining the battery while the motor is off.  You just have to find it.
It supplies the power for the alternator's field, without it the
alternator output will go to nearly zero.  Also the "Alternator" warning
light, being powered from the same circut, won't come on.  If the
regulator is seperate you could also open the field circuit itself.  The
"Alternator" light should come on.  Expect to create a big inductive
"kick" in either case.

Do not interrupt the alternator's output wire, which leads from the
alternator to the battery.  Usually it is a heavy wire connected with a
bolt rather than a push-on terminal.  If this circuit is opened, not only
will the switch have to stop a lot of current, but the alternator voltage
will rise out of control, which can damage the diodes in the alternator.

>
>john pearson wrote:
>
>> I have a Ford 2 wire alternator. Can I turn it off, at idle, so that
>it will
>> 'freewheel', not charge the battery and not load down the motor? If
>so,
>> would it hurt to turn it back on again after about 30 seconds while
>at idle?

I'm not sure what you're trying to accomplish, but it shouldn't damage
anything anyway.  USually the mechanical load from the alternator is
slight once the battery is charged.  You should be able to turn it off
and on at any speed.  There may be a big voltage spike when turning it
back on but the electronics in the car should be able to handle it.

_____________________________________________________________________
You don't need to buy Internet access to use free Internet e-mail.
Get completely free e-mail from Juno at http://www.juno.com
Or call Juno at (800) 654-JUNO [654-5866]

1998\08\08@010552 by David VanHorn

flavicon
face
>You could if you wanted to
>Just disconnect the hot (most likely red, not blue or black) wire, and hook
up a
>switch.


OH NO!! Do I cut the red wire, or the blue????  5....4  The red...3....NO
THE BLUE...Clip.....


Why do all movie bombs have a "red wire" and a "blue wire"??
I think all evil geniuses should go on strike, and use purple and orange,
maybe a nice yellow one too..

1998\08\08@020439 by ken

flavicon
face
At 11:58 PM 8/7/98 -0500, you wrote:
>>You could if you wanted to
>>Just disconnect the hot (most likely red, not blue or black) wire, and hook
>up a
>>switch.
>
>
>OH NO!! Do I cut the red wire, or the blue????  5....4  The red...3....NO
>THE BLUE...Clip.....
>
>
>Why do all movie bombs have a "red wire" and a "blue wire"??
>I think all evil geniuses should go on strike, and use purple and orange,
>maybe a nice yellow one too..

Yeah, you wonder how it is, given the proliferation of maliciously-intended
expolsives in movies, that *all* mad bombers use the same color-coding
convention.  If you truly want your bombs to be difficult to diffuse by
"cutting the right color" then you make all the wires white :)

Ken

1998\08\08@020856 by ken

flavicon
face
Won't de-energizing the alternator field cause the voltage regulator to
burn out?  Isn't this simulating a burned-out field coil wire or burnt
contacts?  As far as voltage spikes - you should be able to wire a large
capacitor across your output leads (a "condenser" like what is used in the
ignition system on older cars could to the job maybe).

I'm probably ill-informed, so feel free to ignore me completely :)

Ken

1998\08\08@173232 by cousens

flavicon
face
john pearson wrote:
>
> I have a Ford 2 wire alternator. Can I turn it off, at idle, so that it will
> 'freewheel', not charge the battery and not load down the motor? If so,
> would it hurt to turn it back on again after about 30 seconds while at idle?
> I would do this through the regulator, wouldn't I?
> Thank you
> John

yes, yes and yes
but it would be better to control the alternator output volts,
so your batterys state of charge would also be included
in the equation.

I assume your regulator is external,
with the two wire alternator with inbuilt regulator
where the second wire goes to the charge light
things are a little difficult.
they have 3 extra diodes that power the regulator direct
( in parallel with the charging light, 12V via the light provides
power for initial excitation before, the alternator provides its own
excitation voltage ).
Once they start charging it's not easy to ensure they stop
without stopping the engine

If you want a gif circuit of a regulator thats easy to make,
easy to control ( with a pic of course )
and reliable ( been running on my car, 95A alternator,
7 years with no problems )

Then you could make a much smarter system
ie:engine over 1000 rpm + brake        = regulate@15V (regenerative
braking !)
  engine accelerating fast            = reg@12.6V    (max acceleration)
  engine under 800 rpm                = reg@13.2V    (min charge)
  engine speed steady over 1000 rpm   = reg@13.8V    (normal charge)

--
Peter Cousens
email: .....cousensKILLspamspam@spam@her.forthnet.gr  phone: + 3081 380534
snailmail:  Folia, Agia Fotini, Karteros, Heraklion  Crete, Greece.

More... (looser matching)
- Last day of these posts
- In 1998 , 1999 only
- Today
- New search...