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djcdmv's Avatar
 
Join Date: Jul 2010
Location: Western New York
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volt meter numbers from battery test...

Hello,
I've been having the seatbelt warning light come on during acceleration. Searched posts and thought it is probably the Voltage regulator. Other members said to check the battery with a volt meter, so here it is:

Car off: 12
at idle: 13 to 14
at 2,000+ rpm: 17 (and usually the seatbelt light at the same time)

Are these numbers a sign of the VR or the alternator, or something completely different?

Also, does anyone know the difference between the 2 VRs our host sells? The Valeo brand is $57.50 and the Hueco is $27.

Thanks in advance.

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Dave
Black 1985 911 Carrera M491
Old 09-03-2010, 04:50 PM
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Don't know the difference, but it looks as if you need one.
Old 09-03-2010, 05:07 PM
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i agree. you should never see as reading of 17v.
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He is.... nineball. I don't always drive sports cars, but when I do I drive a 1983 911SC Targa. Stay fast my friends.
Old 09-03-2010, 06:35 PM
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VR for sure. I suggest you call our host and ask them what they think about the difference between the two.
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Joe
See Porsche run. Run, Porsche, Run: `87 911 Carrera
Old 09-03-2010, 07:04 PM
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Don't be driving it until you get it fixed.

17V can fry expensive stuff (computer, wiring, etc) and can start a fire.
Old 09-03-2010, 09:30 PM
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Thanks all!

This is my first time doing this. Is there a way to get the fan off without jamming a screwdriver in it to stop it from moving?
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Dave
Black 1985 911 Carrera M491
Old 09-04-2010, 06:04 AM
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STOP !.... do not "jam a screwdriver into the fan blades !..."

Hey neighbor in Amherst ! ..... see my technical write up here--->

Pelican Technical Article: 911 Alternator & Voltage Regulator Removal/Replacement

I used the Huco..no issues. Also, once the alternator is out, good idea to have it gone over by an electrical shop. I had new bearings and new copper slip rings installed ( badly worn out grooves). Suggest the good people at Suburban Electric in Depew, not too far from you....



EDIT--> 12V at battery terminals indicates a nearly dead battery.

full charge...12.6-12.7 volts
75% charge....12.4 V
50% charge....12.2 V
24% charge.... 12.0 V
"Dead"............ < 12V
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Wil Ferch
85 Carrera ( gone, but not forgotten )

Last edited by Wil Ferch; 09-04-2010 at 07:12 AM..
Old 09-04-2010, 07:09 AM
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Quote:
Originally Posted by djcdmv View Post
Thanks all!

This is my first time doing this. Is there a way to get the fan off without jamming a screwdriver in it to stop it from moving?
The tool kit has a wrench to put over the pulley.
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Rick
88 Cab
Old 09-04-2010, 07:21 AM
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Quote:
Originally Posted by Wil Ferch View Post

Hey neighbor in Amherst ! ..... see my technical write up here--->
Hi Wil!!!

Thanks everyone for the info.

Wil, that write up will help a ton. I'm glad to find someone 20 minutes away with your experience. I'm sure I'll have plenty of questions and will need advice on where to take my car.
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Dave
Black 1985 911 Carrera M491
Old 09-04-2010, 10:39 AM
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Dave in Amherst:

Best place to "take" your car is... IMHO.... your own garage.

I pretty much learned this way..... the 911 was not only an occasional driver, it allowed you work on the car.... slowly if you needed to...because you had other daily drivers when Monday rolled around and had to be at work. Nice thing about this is that you can visualize and think through your repair work, without rushing to finish on a deadline....with a great bunch of guys here who will help.

Maybe I'll see you at tomorrow's foreign car show at Como Park ?.

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Wil Ferch
85 Carrera ( gone, but not forgotten )
Old 09-04-2010, 05:32 PM
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