Voltage Regulator on my 5.0? - Page 2 - Muscular Mustangs
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post #11 of 16 Old 08-26-2010, 10:32 AM Thread Starter
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Re: Voltage Regulator on my 5.0?

I have bought a new battery, and replaced the battery cables. Now still have a problem, 2 days lated battery was dead.
I did some tests with the meter, and let me know what you think;
At an idle with headlights on high my reading was 12.37, i then turned the A/C on high and my reading was 12.21.
I stuck the accelerator to do 3000 rpms, and got a reading of 12.27
I did read that the Battery voltage Should read between about 13.8 to 14.2 volts. (Possibly up to 14.5 Volts., if thats the case then would you say change the alternator?

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post #12 of 16 Old 08-26-2010, 10:56 PM
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Re: Voltage Regulator on my 5.0?

Technically it could be a wiring problem but yes most likely that is the alternator. Have had the exact same problem twice on the fox body I used to own.



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post #13 of 16 Old 08-27-2010, 12:07 PM Thread Starter
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Re: Voltage Regulator on my 5.0?

Just to be sure, I had the diagnostic test done this morning at AdvanceAutoParts, and TireKingdom, both results said the Altenator, but one test at AdvanceAutoParts had a drain test, and the results were 3.19A "Suspect"

I will go out and buy a new Alternator this week.

If 3.19A "Suspect" is still there after replacing the Alternator, then there are other issues.
(1) 4 weeks ago my cruise control would not cut off when braking, only when hit off button.
(2) my brake lights burned out

Any thoughts?
Paul

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post #14 of 16 Old 08-29-2010, 09:39 PM
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Re: Voltage Regulator on my 5.0?

Electrical gremlins are the worst. The brake lights and cruise could be coincidental. But change the alternator and hope all i well..

'87 GT with a battery
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post #15 of 16 Old 08-30-2010, 03:53 PM
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Re: Voltage Regulator on my 5.0?

Definitely change the alternator first. Then to track down the draw you can usually disconnect the negative battery cable and place a test light between the battery terminal and cable. The light may turn on dimly or not at all, however If the it shines bright there something is drawing power that shouldn't. To find the problem the first thing you do is start pulling fuses and redoing the test. Once the light dims or goes out then you've found the circuit that has the draw. From there its just a matter of trying your best to track down the problem, such as if that circuit has the radio in it try disconnecting the radio and see if the light dims or goes out.

BTW If you do a search on google for battery parasitic draw test you'll find a ton of information on finding the fault. There are also a bunch of videos on youtube on the subject.



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post #16 of 16 Old 09-12-2010, 07:34 AM Thread Starter
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Re: Voltage Regulator on my 5.0?

All is well now, I bought a new Alternator.

Thanks for putting up with me.

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