Good Sam Club Open Roads Forum: Tech Issues: Help Me Understand
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ScottG

Bothell Wa.

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Posted: 03/09/20 02:06pm Link  |  Quote  |  Print  |  Notify Moderator

14 is totally normal in a modern vehicle. If it's very cold it will be even higher than that and if it's hot, it will be lower.
No worries.


Scott, Grace and Wesly
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red31

Dallas

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Posted: 03/09/20 02:37pm Link  |  Quote  |  Print  |  Notify Moderator

RVC

https://www.youtube.com/watch?v=8NRajpYXGb4

MEXICOWANDERER

las peñas, michoacan, mexico

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Posted: 03/09/20 03:32pm Link  |  Quote  |  Print  |  Notify Moderator

Help ME understand how a Delco Remy 145 amp alternator with Integral regulator is NORMAL showing almost 16-volts.

Ooooooooooo it can't hurt the battery
Ooooooooooo it's sone for the vehicle electricals

This is

NOT
NOT
NOT

NORMAL

Maybe the gauge maybe the regulator. The ONLY thing the ECU sees is the C connection of the alt which is an analysis of the ROTOR CURRENT

This will throw a ECU CODE

It ain't a Dodge and it ain't a Ford.

Recommendation
Take it to a genuine rebuilder shop and get it CORRECTLY DIAGNOSED


(16 VOLTS WE ITHOUT THROWING A CODE MY JACKASS)

DrewE

Vermont

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Posted: 03/09/20 04:56pm Link  |  Quote  |  Print  |  Notify Moderator

According to GM's technical documentation on the subject, such as the one lawrosa linked above, the target output voltage in "charge mode" ranges between 13.9 and 15.5 volts depending on the battery state of charge and the estimated battery temperature. 15.8V actual doesn't sound too far out of line (particularly when made with measurement equipment of unknown precision).





MEXICOWANDERER

las peñas, michoacan, mexico

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Posted: 03/09/20 05:24pm Link  |  Quote  |  Print  |  Notify Moderator

Fifteen point eight is too high Drew

Northern California? 15.8 ?

It may be just the gauge.

Not worth the risk to guess at this. 16.0 volts will start damaging the chassis control module and the fact the ECU has not thrown a code is damning. love to see a LA battery that withstands 15.8 @ 70F which California has been enjoying.

Like being squashed in a packed elevator against a coughing feverish person.

Like the old Peanuts strip

CB My dad said our car started making funny noises coming home from work


Linus so what did he do?

CB. He turned up the radio

time2roll

Southern California

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Posted: 03/09/20 07:50pm Link  |  Quote  |  Print  |  Notify Moderator

I would be curious why the battery and alternator are not very close in voltage. Seems like an open circuit to me.


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time2roll

Southern California

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Posted: 03/09/20 07:53pm Link  |  Quote  |  Print  |  Notify Moderator

MitchF150 wrote:

That's what a gauge is supposed to do.. Unlike the Ford ones which just sit at one position and is nothing more than a warning light..
What is to warn? Usually an alternator is working fine until it is not. If the gauge says normal I agree all is fine. Mine did register low once out in Wyoming. Pulled over at the next town and replaced it. Back to normal ever since with no reason to get in the dealer to check on fluctuations.

jodeb720

Los Angeles

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Posted: 03/09/20 09:35pm Link  |  Quote  |  Print  |  Notify Moderator

Mex is correct.

I had a 2003 silverado 6.0L - and charged, the voltage was just above 13 on my gauge (13.2 to be exact on my multimeter).

A couple of times, the battery got run pretty far down and the voltage was above 14 on my gauge - and I believe it was 14.4 to 14.6 during the initial charge - but never anywhere near 15.

GM's alternators are one wire - meaning the voltage regulator is built into the alternator. It sounds to me like the voltage regulator is going out.

Last Summer, My alternator went out on my chevy - due to not charging - and I replaced it on a depleted battery. It was at 14.5 or so on my gauge. I drove it for about 30 minutes and it was just a tad over 14.

josh

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