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Charging Voltage = 15+ ??

 
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  • 1 Post By CREWZIN
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Old 11 Sep 2012, 03:03 pm
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Question Charging Voltage = 15+ ??

I had an incident with the dash lights having a spasm and after reading posts here, checked my battery and charging sytem. At rest the battery reads 12.65v and has never been week. When I started it, I was quite surprised to read 15+ volts and it varied from 14.8 to 15.4 Turning on lights, blower, radio etc it increased a bit to 15.5-15.7. Even after a full warm up (cooling fans came on) and all accessories off again, it was still reading around 15.1 and still varying.
I'm no expert, but this seems way high. My other car reads 14.2 when charging, so I assume my meter is correct.
I don't suppose there is a simple voltage regulator that can be replaced like the good old days.
Any advice from the collective wisdom of the masses?
('06 GT 5spd convertible)

Thanks to all for contributing your knowledge on this site,
Phil
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Old 11 Sep 2012, 03:41 pm
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Default Re: Charging Voltage = 15+ ??

Photobucket is having problems right now or I'd show you the schematic of the charging system (at least for the earlier models). There's no separate voltage regulator, it's built into the alternator.

My suggestion, is to take it to an auto store, like AutoZone, that does free battery and charging system tests and see what they say.

Found the picture on another post:

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Old 11 Sep 2012, 03:56 pm
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Default Re: Charging Voltage = 15+ ??

There's no voltage regulator in the alternator of a 2006 model, unless it's a 1.6 or 2.2, which would be in Europe.

The voltage output is controlled by the PCM.
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Old 11 Sep 2012, 04:48 pm
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Default Re: Charging Voltage = 15+ ??

Chris,

What about the 01-05 models and the schematic I put up. Don't know my electrics. Does that show a regulator in the alternator or are the earlier models the same as 06+ ???
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Old 11 Sep 2012, 05:33 pm
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Default Re: Charging Voltage = 15+ ??

Quote:
Originally Posted by CREWZIN View Post
Chris,

What about the 01-05 models and the schematic I put up. Don't know my electrics. Does that show a regulator in the alternator or are the earlier models the same as 06+ ???
Hey Crewzin. The schematic you posted shows that the generator field is controlled by the PCM. The output voltage is still regulated, just by the PCM.

Ron
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Old 11 Sep 2012, 05:38 pm
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Default Re: Charging Voltage = 15+ ??

Update:

I Got out an old analog meter as well as a battery load meter. I think my digital meter is off by about a half volt. The other two (analog) meters showed about 14 3/4 volts. The load meter showed the battery strong under load (stayed over 11.5)
So I am confident that the battery is good, and althought the charging is a bit high I don't think its enough to worry about.
I got into the ignition switch and did a little cleaning on the terminals and hope I won't have any more episodes with the dash warning lights. It was not fun being 70 miles from home in the middle of S.F and have her die on me. Luckily she re-started right away and has had no problems since.

Phil

PS: I forgot to mention, I finally got it to show me the fault codes and there were none.

Last edited by philbaz; 11 Sep 2012 at 05:47 pm. Reason: added PS
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Old 11 Sep 2012, 06:54 pm
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Default Re: Charging Voltage = 15+ ??

Thanks Ron.
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Old 11 Sep 2012, 08:01 pm
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Default Re: Charging Voltage = 15+ ??

Ron is correct. All US PTs have voltage output regulated by the PCM, not a separate voltage regulator.
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Old 11 Sep 2012, 09:47 pm
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Default Re: Charging Voltage = 15+ ??

There were lots of reports of surging or unstable voltage, don't recall what fix was.
IIRC, some found one battery cell was bad, others found poor connections.
In any case 15.5 volts isn't an indicator of a full-fielding alternator, if alternator were full fielding it'd be closer to 18volts.
Voltage is set via VR (as mentioned) with input from a temp sensor.
So if it's like, Minnesota in January, it'll be blasting in the 15v range.
Death valley- very low.
If you're interested, there is a chart in the factory manual.

I've seen alternators function with a diode or two blown, IIRC (Prolly not) it was on one of my vehicles.

I'd do as Crewzin suggests, then check all the connections.
Mine did this, the battery was bad, but just lived with it.
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Old 22 Jan 2013, 04:20 pm
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Default Re: Charging Voltage = 15+ ??

A voltage of up to 15V is ok but I donít think there is much to worry about. If you know your electronics, there is a small adjustable resistance in the circuit, change the values till you can reach your desired value of 14V. Donít reduce it more than 14V which can affect the charging of your battery.
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