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Alternator Charge Rate

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southsideguy
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Alternator Charge Rate

Postby southsideguy » February 21st, 2019, 12:16 am

Hello there. Would like to put out some tests results obtained using a multimeter and cigarette lighter voltage display.

Tools Used - Innova Cigarette Lighter Tester & Etepon True RMS Multimeter. Got these testers to sell also for those who interested.

Engine Off | Ignition On
Cigarette Voltage Tester - 12.6v
Multimeter on Battery - 12.6v

Engine Running
Cigarette Voltage Tester - 12.5v to 14v [Not constant but rarely goes up to 14, basically most of the time between 12 and 13]
Multimeter on Battery - In the 13, rarely goes to 14.

Question is why are the readings seldom 14? Vehicle is a Mazda 3.
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hong kong phooey
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Re: Alternator Question

Postby hong kong phooey » February 21st, 2019, 12:32 am

Yes
If you want to know your charging voltage test with a multimeter at the battery.

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southsideguy
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Re: Alternator Question

Postby southsideguy » February 21st, 2019, 8:43 am

I did. At the battery while engine running, hardly ever gets up to 14. Always in the 13.

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Re: Alternator Question

Postby gastly369 » February 21st, 2019, 9:08 am

What car?

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Re: Alternator Question

Postby Galvatron » February 21st, 2019, 9:08 am

Check the condition and tension of the alternator belt, the earth strap, ensuring all connections are clean and tight and the condition of the battery.

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southsideguy
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Re: Alternator Question

Postby southsideguy » February 21st, 2019, 9:14 am

Mazda 3. Electrician check it, he say everything normal. New brand battery.

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southsideguy
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Re: Alternator Question

Postby southsideguy » February 21st, 2019, 9:15 am

Had to buy new battery as previous battery was suddenly dead overnight.

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Re: Alternator Question

Postby maxtech » February 21st, 2019, 9:54 am

Charging voltage for cars are normally 13.8 to 14.5....OP you alternator not charging the battery. Even if you purchase a new battery it will eventually damage that battery too. You can check you belt tension around the alternator to make sure it's tight enough.

When you change you alternator change your electrician too.

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Re: Alternator Question

Postby adnj » February 21st, 2019, 10:19 am

maxtech wrote:Charging voltage for cars are normally 13.8 to 14.5....OP you alternator not charging the battery. Even if you purchase a new battery it will eventually damage that battery too. You can check you belt tension around the alternator to make sure it's tight enough.

When you change you alternator change your electrician too.
+1. Your alternator's voltage regulation is faulty. Check the voltage at the alternator output and go from there.

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hong kong phooey
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Re: Alternator Question

Postby hong kong phooey » February 21st, 2019, 1:05 pm

No that sounds about right.
Did you rev the car ?
some vehicles the alternator produces about 13 V when the rpm increases then the voltage goes up to 13.8 V

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southsideguy
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Re: PLEASE DELETE

Postby southsideguy » February 22nd, 2019, 2:33 pm

PLEASE DELETE

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southsideguy
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Re: PLEASE DELETE

Postby southsideguy » February 22nd, 2019, 7:28 pm

PLEASE DELETE

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hong kong phooey
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Re: PLEASE DELETE

Postby hong kong phooey » February 23rd, 2019, 12:33 am

southside guy
was it sorted ? share your findings it can be a learning experience for us

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Re: PLEASE DELETE

Postby RedVEVO » February 23rd, 2019, 3:05 am

13 good, it a range value ..

10 and under is bad

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southsideguy
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Re: Alternator Charging

Postby southsideguy » February 23rd, 2019, 8:58 am

Here is my findings. I am using two pieces of tools, a voltage display on the cigarette lighter and a multimeter on the battery.

At engine off with ignition on:
[1] 12.6v on the cigarette lighter device

At engine off with ignition off:
[1] 12.6v on the battery using the multimeter

At engine running with no ac or anything else:
[1] 12.4v to 13.5v on the cigarette lighter device [it varies, does not remain constant]
[2] 13.5v at the battery terminals [constant]

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Re: Alternator Charging

Postby sMASH » February 23rd, 2019, 9:41 am

Start it, disconnect the battery and see what the alternator supplies on its own...

New tech giving less than 14v is suspec

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Re: Alternator Charging

Postby adnj » February 23rd, 2019, 11:23 am

13.5 volts at the battery terminals indicates that the voltage regulator is working below range. 12.6 volts with the engine off and the battery connected indicates that your battery is at or near (80% to 100%) full charge.

A 12 volt battery will have a 2.2 volt drop across each cell during charging (13.2 volts typical). You must overcome this potential to charge your battery. You charging system is working but not as well as it should.

Your cigar lighter outlet will likely show a different voltage than the B+ terminal voltage because of the added resistance of the wiring, fuse and terminals through the wire harness.

Increasing the electrical vehicle load may cause a voltage drop on the alternator as it sources current while at the same time the battery is at a higher voltage than the alternator and begins to dischagre.

Voltage fluctuations are likely due to electrical current draw from the ignition and control circuits, float at the negative connection to ground of the cigar lighter circuit, and possibly the design of the meter.

The only accurate way to read your battery voltage with your instrument panel meter is to wire it directly to the charge cable or the maxi fuse block of your car.

southsideguy wrote:Here is my findings. I am using two pieces of tools, a voltage display on the cigarette lighter and a multimeter on the battery.

At engine off with ignition on:
[1] 12.6v on the cigarette lighter device

At engine off with ignition off:
[1] 12.6v on the battery using the multimeter

At engine running with no ac or anything else:
[1] 12.4v to 13.5v on the cigarette lighter device [it varies, does not remain constant]
[2] 13.5v at the battery terminals [constant]

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southsideguy
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Re: PLEASE DELETE

Postby southsideguy » February 24th, 2019, 11:00 am

PLEASE DELETE

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southsideguy
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Re: PLEASE DELETE

Postby southsideguy » February 25th, 2019, 10:50 am

PLEASE DELETE

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southsideguy
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Re: PLEASE DELETE

Postby southsideguy » February 26th, 2019, 10:15 am

PLEASE DELETE

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southsideguy
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Re: PLEASE DELETE

Postby southsideguy » February 26th, 2019, 3:38 pm

PLEASE DELETE

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southsideguy
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Re: PLEASE DELETE

Postby southsideguy » February 28th, 2019, 3:53 pm

please delete

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southsideguy
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Re: PLEASE DELETE

Postby southsideguy » March 1st, 2019, 1:14 pm

PLEASE DELETE

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southsideguy
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Re: PLEASE DELETE

Postby southsideguy » March 3rd, 2019, 7:54 am

PLEASE DELETE

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southsideguy
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Re: PLEASE DELETE

Postby southsideguy » March 5th, 2019, 6:26 pm

Bump uppp

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southsideguy
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Re: PLEASE DELETE

Postby southsideguy » March 6th, 2019, 8:57 am

PLEASE DELETE

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southsideguy
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Re: PLEASE DELETE

Postby southsideguy » March 6th, 2019, 1:34 pm

PLEASE DELETE

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southsideguy
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Re: Alternator Charge Rate

Postby southsideguy » March 7th, 2019, 9:14 am

updated

kripplerz
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Re: Alternator Charge Rate

Postby kripplerz » July 7th, 2019, 8:21 am

Any updates with your situation. Is your batter still ok, alternator working fine ? Curious to find out.

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eitech
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Re: Alternator Charge Rate

Postby eitech » July 7th, 2019, 11:23 am

Came across this link. Have a look at the comments All i have been hearing about alternators is once u start is 13-14v and anything else means something is wrong. Of course there will be the nay sayers.

https://www.quora.com/My-car-battery-vo ... alternator

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