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Join Date: Nov 2002
Location: Central California
Posts: 46
Would a bad voltage regulator---

permit TOO much voltage? Was thinking my voltage gauge was wonky when it started
reading almost 16v on start up. (Settles down to 14v+ after a minute or 2).

Checked voltage at battery not running-- 14.5v
and running-- 15v or so

So, now wondering if my multi meter's out of calibration.

Or, voltage reg. going or n.g.

Thanks for any thoughts,

p2
Old 06-03-2015, 04:40 PM
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83 911 Production Cab #10
 
JJ 911SC's Avatar
 
Join Date: Jun 2009
Location: Ottawa, Ontario, Canada
Posts: 10,683
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Yes, BTDT, boiled the battery and luckily I did not fry anything else.

VR will limit the voltage to 14.2 Volts to charge the battery. When they go bad, they can put out up to 17-18 volts which is not good...

In your case 14.5 volts at the battery with the engine off is not good, should be in the 12V range.

Double check with another Voltmeter and if it remain the same, time for a new VR.
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83 911 Production Cab #10, Slightly Modified: Unslanted, 3.2, PMO EFI, TECgt, CE 911 CAM Sync / Pulley / Wires, SSI, Dansk Sport 2/2, 17" Euromeister, CKO GT3 Seats, Going SOK Super Charger

Last edited by JJ 911SC; 06-03-2015 at 04:49 PM..
Old 06-03-2015, 04:44 PM
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Yep its toast,and you will toast your battery also soon,don't go any further till you change it out,13.8 volts is generally the max,cheers
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Old 06-03-2015, 10:34 PM
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Thanks guys.

For the help. Got a spare around here somewhere...

p2
Old 06-04-2015, 06:18 AM
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Location: Upstate NY
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you can open up the vr and clean the points. just have to pry the cover off
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Old 06-04-2015, 05:17 PM
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Location: Central California
Posts: 46
Let that be a lesson to me...

Swapped in another v.r. and everything's back as it should be voltage wise.

Close inspection revealed near new Optima with a small bit of brown ooze
exiting the vent things on top of the battery. Reads 13.5v so hopefully I
didn't do it much harm.

Evidently couple hundred miles at too much voltage= bad for battery.

Live & learn---pay for the education.

p2
Old 06-04-2015, 06:46 PM
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