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Old 28 Mar 2007, 06:01 pm
RandyCamp
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Default Losing Voltage

My '90 Acura Legend is losing power while the car is running. My volt
meter reads 14 at the beginning, and about 2 minutes later, it reads
under 13. I tested my alternator and it passed at auto zone. Any
suggestions?

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  #2 (permalink)  
Old 28 Mar 2007, 06:41 pm
MZ
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Default Re: Losing Voltage


"RandyCamp" <hrmajor@gmail.com> wrote in message
news:1175119290.082458.281130@p15g2000hsd.googlegr oups.com...
> My '90 Acura Legend is losing power while the car is running. My volt
> meter reads 14 at the beginning, and about 2 minutes later, it reads
> under 13. I tested my alternator and it passed at auto zone. Any
> suggestions?
>


Are you turning on A/C or other accessories?
MZ


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Old 28 Mar 2007, 07:13 pm
Michael Pardee
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Default Re: Losing Voltage

"RandyCamp" <hrmajor@gmail.com> wrote in message
news:1175119290.082458.281130@p15g2000hsd.googlegr oups.com...
> My '90 Acura Legend is losing power while the car is running. My volt
> meter reads 14 at the beginning, and about 2 minutes later, it reads
> under 13. I tested my alternator and it passed at auto zone. Any
> suggestions?
>
>


You don't mention the mileage, but guessing it's around 150K miles or so the
alternator brushes are probably worn out. Often they are worse when warm,
but mostly that is a marginal difference. Brush trouble shows up in the
early stages as intermittent charging, and a '90 might be early enough that
the warning light won't tell you anything is wrong. More recent Hondas use a
separate sensing circuit.

If you are seeing the voltage pop up and down, gradually becoming more down
than up, you are probably seeing the brushes make their last stand.
Replacing the brushes, assuming you can obtain them, is a cost-effective
approach. See Elle's web page on that at
http://home.earthlink.net/~honda.lioness/id13.html - her site is tailored
more for Civics but the principles are the same.

Avoid aftermarket rebuilt alternators. They have earned a reputation for
poor reliability.

Mike



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Old 28 Mar 2007, 09:06 pm
Tegger
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Default Re: Losing Voltage

"RandyCamp" <hrmajor@gmail.com> wrote in news:1175119290.082458.281130
@p15g2000hsd.googlegroups.com:

> My '90 Acura Legend is losing power while the car is running. My volt
> meter reads 14 at the beginning, and about 2 minutes later, it reads
> under 13. I tested my alternator and it passed at auto zone. Any
> suggestions?
>



It's bad. Replace the alternator. Voltage at idle should be 14.4V.

If you choose an aftermarket reman, it WILL fail in just over a year.
Guaranteed. It does not matter where you buy it, NAPA, AutoZone, Kragen,
they're all lousy.

If you spend twice the money to get a genuine Honda reman, you can install
it and forget about it.

There is a slight chance the brushes are worn, but this normally manifests
itself as a flickering charge light.

--
Tegger

The Unofficial Honda/Acura FAQ
www.tegger.com/hondafaq/
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Old 29 Mar 2007, 12:22 pm
motsco_
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Default Re: Losing Voltage

RandyCamp wrote:
> My '90 Acura Legend is losing power while the car is running. My volt
> meter reads 14 at the beginning, and about 2 minutes later, it reads
> under 13. I tested my alternator and it passed at auto zone. Any
> suggestions?
>

--------------------------------

Any time the alternator circuit is discussed, it's probably a good idea
to SEARCH google and understand the Honda ELD, since it affects any
measurements and might fool the AutoZone people, or yourself.

'Curly'
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  #6 (permalink)  
Old 29 Mar 2007, 08:07 pm
Michael Pardee
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Default Re: Losing Voltage

"motsco_" <motsco_@interbaun.com> wrote in message
news:130nm9nclkk41d@corp.supernews.com...
> RandyCamp wrote:
>> My '90 Acura Legend is losing power while the car is running. My volt
>> meter reads 14 at the beginning, and about 2 minutes later, it reads
>> under 13. I tested my alternator and it passed at auto zone. Any
>> suggestions?
>>

> --------------------------------
>
> Any time the alternator circuit is discussed, it's probably a good idea to
> SEARCH google and understand the Honda ELD, since it affects any
> measurements and might fool the AutoZone people, or yourself.
>
> 'Curly'
>


I confess I don't understand the ELD. Do you have a good link for it?

Mike



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  #7 (permalink)  
Old 29 Mar 2007, 11:22 pm
Tegger
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Default Re: Losing Voltage

"Michael Pardee" <michaeltnull@cybertrails.com> wrote in
news:54ydnW6x5ZB8yZHbnZ2dnUVZ_segnZ2d@sedona.net:

> "motsco_" <motsco_@interbaun.com> wrote in message
> news:130nm9nclkk41d@corp.supernews.com...
>> RandyCamp wrote:
>>> My '90 Acura Legend is losing power while the car is running. My
>>> volt meter reads 14 at the beginning, and about 2 minutes later, it
>>> reads under 13. I tested my alternator and it passed at auto zone.
>>> Any suggestions?
>>>

>> --------------------------------
>>
>> Any time the alternator circuit is discussed, it's probably a good
>> idea to SEARCH google and understand the Honda ELD, since it affects
>> any measurements and might fool the AutoZone people, or yourself.
>>
>> 'Curly'
>>

>
> I confess I don't understand the ELD. Do you have a good link for it?
>





I'm not sure I understand it either. Found this link:
http://www.asaaz.org/canyonauto/techtips.htm

See item six, "Honda Information".

The factory service manual is devoid of info on the ELD, strangely enough.

I'm also not sure the Legend uses an ELD. Too old, no? I have a Helm manual
for the '91 Legend. No ELD is shown.


--
Tegger

The Unofficial Honda/Acura FAQ
www.tegger.com/hondafaq/
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