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Old 10-24-2005, 12:34 AM   #1
(a.a)
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Default Battery output voltage 17.76V

I have checked my battery output voltage (Engine running) and it shows 17.76 Volts. The pover is steady at all RPM's. How to adjust a "Voltage regulator", or do I have to buy a new one? I believe it's external, not inside the alternator.
I also found these "Voltage Stabilizers" are they really necessary?
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Last edited by (a.a); 10-24-2005 at 02:26 AM.
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Old 10-24-2005, 01:20 AM   #2
Master2192
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Well, you didn't list what year car you've got or anything. But usually newer cars have the voltage regulator inside the alternator. You can goto a shop and they can diagnose it better and most likely replace the regulator pretty cheap. Or they may recommend to replace the alternator. As far as i know, my 98 RS does not have an external voltage regulator.
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Old 10-24-2005, 01:30 AM   #3
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It's 1999 Impreza Outback Sport F4-2.2L SOHC.

I checked the Voltage again, now it's 18.36V.
Is it too dangerous to drive due to battery explosion at this voltage?

ALLDATA shows "Voltage Regulator" as a separate part [OEM Part 23815AA140] Price - 180.00$

There is a link to "Internet Catalog" on this:
ww.transpo.de/cgi-win/product.exe?IM848
It seems replaceable.

Last edited by (a.a); 10-24-2005 at 01:57 AM.
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Old 10-24-2005, 01:47 AM   #4
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yes get that fixed, jesus

the VR is inside of the alternator iirc

pull the alt adn have shucks test it or something

normal car electronics are made to operate within 11-15 volts iirc
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Old 10-24-2005, 08:52 AM   #5
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Blowing up your battery would probably be the cheapest thing that could go wrong. I'd stop driving it like that immediately and fix it.
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Old 10-24-2005, 09:05 AM   #6
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I agree. Don't drive it until you get that fixed.
Since readings that high are unsual, I'd also recommend verifying the voltage with a different meter before you go replacing anything.
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Old 10-24-2005, 11:27 AM   #7
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Quote:
Originally Posted by Mulder
I agree. Don't drive it until you get that fixed.
Since readings that high are unsual, I'd also recommend verifying the voltage with a different meter before you go replacing anything.
ditto
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Old 10-28-2005, 09:14 AM   #8
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any updates?
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Old 10-28-2005, 02:02 PM   #9
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Yes, fix that before you blow your ECU or something equally expensive. That is not safe.

ditto to the above, the voltage regulator is usually part of the alternator, but you may be able to have it repaired rather than get raped for a whole new alternator.

You should read about 11.5-12.5V when the engine is off. That would be a good check for your multimeter.
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Old 10-30-2005, 03:26 AM   #10
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Yeah I got it fixed for now. I have dismantled the alternator a part to see that regulator. Nothing could be fixed. Ordered a new one online at Subaruparts. The same alternator goes to Mitsubishi and a few other cars. If they had one at the time it would be cheaper.

What about that "Voltage regulator" on eBay is is really useful?
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Old 10-30-2005, 06:49 AM   #11
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Quote:
Originally Posted by (a.a)
What about that "Voltage regulator" on eBay is is really useful?
Nothing. Just replace your alternator if it's bad and you're done. You can add some DIY ground wires if you like but don't buy anything that claims to regulate or stabilize the voltage, those things are BS and totally unnecessary.
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