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-   -   volt meter numbers from battery test... (http://forums.pelicanparts.com/porsche-911-technical-forum/562506-volt-meter-numbers-battery-test.html)

djcdmv 09-03-2010 04:50 PM

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.

Zeke 09-03-2010 05:07 PM

Don't know the difference, but it looks as if you need one.

nineball 09-03-2010 06:35 PM

i agree. you should never see as reading of 17v.

Por_sha911 09-03-2010 07:04 PM

VR for sure. I suggest you call our host and ask them what they think about the difference between the two.

tcar 09-03-2010 09:30 PM

Don't be driving it until you get it fixed.

17V can fry expensive stuff (computer, wiring, etc) and can start a fire.

djcdmv 09-04-2010 06:04 AM

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?

Wil Ferch 09-04-2010 07:09 AM

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....

SmileWavy

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

rick-l 09-04-2010 07:21 AM

Quote:

Originally Posted by djcdmv (Post 5543079)
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.

djcdmv 09-04-2010 10:39 AM

Quote:

Originally Posted by Wil Ferch (Post 5543150)

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.

Wil Ferch 09-04-2010 05:32 PM

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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