alternator not supplying power to car, battery is. - Chevelle Tech
Electrical & Wiring Troubleshooting electrical problems.

 
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post #1 of 14 (permalink) Old Oct 8th, 13, 1:02 PM Thread Starter
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Gossamer (Mike)
 
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alternator not supplying power to car, battery is.

Alternator checks out fine. Voltage regulator Fine.
Battery is supplying power instead of alternator.
Any steps on tracking This down?
Car dies when headlights are turned on.

My version of the never made '72 SS454 Chevelle Wagon.
454 ATK Engine/550 HP/575 TQ/4.10
gear/T-350 trans./3400 ATI conv/B&M Comp. Shifter/ 1/4 ET-12.39 @108mph - 1.69 60ft.

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post #2 of 14 (permalink) Old Oct 8th, 13, 3:58 PM
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Re: alternator not supplying power to car, battery is.

The battery supplies the power and the alternator is designed to maintain the charge in the battery. If you have an alternator on your car, you do not have a voltage regulator. Voltage regulators are used with generators.

If it was me, I'd replace the battery and alternator.


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post #3 of 14 (permalink) Old Oct 8th, 13, 4:04 PM
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Re: alternator not supplying power to car, battery is.

Quote:
Originally Posted by 72SS454Wagon View Post
Alternator checks out fine. Voltage regulator Fine.
Battery is supplying power instead of alternator.
Any steps on tracking This down?
Car dies when headlights are turned on.
What makes you think that it is running off of the battery Mike?
Did you check the alternator voltage output or how do you know the alternator is OK?

Headlights should run off of the battery also unless it is very low.


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post #4 of 14 (permalink) Old Oct 8th, 13, 4:08 PM
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Re: alternator not supplying power to car, battery is.

Quote:
Originally Posted by Ken Hayes View Post
The battery supplies the power and the alternator is designed to maintain the charge in the battery. If you have an alternator on your car, you do not have a voltage regulator. Voltage regulators are used with generators.

If it was me, I'd replace the battery and alternator.
Alternators have voltage regulators, some external, some internal but our old Chevelles originally had the external type.

Actually, alternators are generators.

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post #5 of 14 (permalink) Old Oct 8th, 13, 5:52 PM
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Re: alternator not supplying power to car, battery is.

Quote:
Originally Posted by Dean View Post
Alternators have voltage regulators, some external, some internal but our old Chevelles originally had the external type.

Actually, alternators are generators.

Marc S


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post #6 of 14 (permalink) Old Oct 8th, 13, 6:32 PM
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Re: alternator not supplying power to car, battery is.

Quote:
Originally Posted by Ken Hayes View Post
The battery supplies the power and the alternator is designed to maintain the charge in the battery. If you have an alternator on your car, you do not have a voltage regulator. Voltage regulators are used with generators.

If it was me, I'd replace the battery and alternator.
Ken,

The alternator is designed to provide all of the power for the vehicle, in addition to providing charge current to the battery. The battery is used for starting, filtering the output of the alternator and provides limited reserve for accessories when the engine is not running.

All charging systems use a voltage regulator. Doesn't matter if it is generator from 1928 or a 2003 alternator (a.c. generator).

Quote:
Originally Posted by 72SS454Wagon View Post
Alternator checks out fine. Voltage regulator Fine.
Battery is supplying power instead of alternator.
Any steps on tracking This down?
Car dies when headlights are turned on.


Marc, You have a voltmeter right??

What is the voltage at the battery with the engine idling between 1500 to 2000 rpm's ?

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post #7 of 14 (permalink) Old Oct 8th, 13, 6:40 PM Thread Starter
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Gossamer (Mike)
 
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Re: alternator not supplying power to car, battery is.

The alternator has neen checked. Its putting out fine.
When i unhook battery car dies. When it sits for awhile i can restart it until battery is drained and it dies.
Voltage regulator is new.

My version of the never made '72 SS454 Chevelle Wagon.
454 ATK Engine/550 HP/575 TQ/4.10
gear/T-350 trans./3400 ATI conv/B&M Comp. Shifter/ 1/4 ET-12.39 @108mph - 1.69 60ft.

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post #8 of 14 (permalink) Old Oct 8th, 13, 6:45 PM Thread Starter
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Re: alternator not supplying power to car, battery is.

Yes i have a voltmeter.
And yes, i have a wife that has a ton of chores for me currently.
If i go out there near car right now its like she has some internal alarm that knows.
Ill get to it as soon as possible and post my findings. Thanks

My version of the never made '72 SS454 Chevelle Wagon.
454 ATK Engine/550 HP/575 TQ/4.10
gear/T-350 trans./3400 ATI conv/B&M Comp. Shifter/ 1/4 ET-12.39 @108mph - 1.69 60ft.

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post #9 of 14 (permalink) Old Oct 8th, 13, 7:27 PM
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Re: alternator not supplying power to car, battery is.

Check voltage at battery before starting and check again with engine running . A good example would be 12.5 volts before start up and a reading of 13.
to 14.5 with engine running . Place load on the alternator with lights on and turn A/C on if you have it , the voltage should stay the same or drop slightly , say half a volt. If it drops below the 12.5 volts read before the engine was started . The alternator or charge circuit is not working with the load applied . You said the alternator was checked and it was ok , but did the alternator get tested with a load?
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post #10 of 14 (permalink) Old Oct 8th, 13, 8:03 PM
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Re: alternator not supplying power to car, battery is.

Okay, Get the Honey-Do list done first to avoid injury

Other thoughts to bear in mind...

You should see at least 13.8 volts at the battery terminals with the 1500-2000 rpm idle (with no major loads turned on). 14.2 is the ideal charging voltage.

NEVER disconnect the battery when the engine is running. This is referred to as open load on the alternator. One of the first things GM and Delco-Remy warn you not to do in any service manual. That is not a valid test and you can damage equipment that way.

A fully charged battery with no parasitic loads on it will read approx. 12.65 volts at rest.

"It tested good". If I had a dime for every time I heard that I would have a lot of dimes. It's just like "but it's a new replacement". It means nothing until troubleshooting rules it out.

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post #11 of 14 (permalink) Old Oct 8th, 13, 8:13 PM Thread Starter
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Re: alternator not supplying power to car, battery is.

Ok im going to check what you guys recommended as soon as i can. Thanks, guys.

My version of the never made '72 SS454 Chevelle Wagon.
454 ATK Engine/550 HP/575 TQ/4.10
gear/T-350 trans./3400 ATI conv/B&M Comp. Shifter/ 1/4 ET-12.39 @108mph - 1.69 60ft.

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post #12 of 14 (permalink) Old Oct 9th, 13, 8:40 AM
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Re: alternator not supplying power to car, battery is.

Is the GEN light on with engine running? Should be if the bulb is good and the wiring is good. Voltage from ignition switch goes through the bulb and to the VR.

Look through the following post, there is a writeup by Peter F that will help diagnose the problem.

https://www.chevelles.com/forums/show...596&highlight=

Hank

70 Chevelle SS396(454), M20, 3.73

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post #13 of 14 (permalink) Old Oct 11th, 13, 9:36 AM Thread Starter
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Gossamer (Mike)
 
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Re: alternator not supplying power to car, battery is.

The only thing I haven't changed is the ignition switch. I'm going to change that out. This may be explaining the starting problem as well.
I'll post my findings.

My version of the never made '72 SS454 Chevelle Wagon.
454 ATK Engine/550 HP/575 TQ/4.10
gear/T-350 trans./3400 ATI conv/B&M Comp. Shifter/ 1/4 ET-12.39 @108mph - 1.69 60ft.

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post #14 of 14 (permalink) Old Oct 14th, 13, 7:13 PM Thread Starter
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Re: alternator not supplying power to car, battery is.

Ok, got it fixed.
It was the ignition switch. All is good once again with the Wagon. Now to make a run to the grocery store.

My version of the never made '72 SS454 Chevelle Wagon.
454 ATK Engine/550 HP/575 TQ/4.10
gear/T-350 trans./3400 ATI conv/B&M Comp. Shifter/ 1/4 ET-12.39 @108mph - 1.69 60ft.

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