All my cars will show over 15 volts at times, including 2 GM alternators, a
97 Merc and a 93 Ford. The Ford dealer shop mgr said, as I quoted, under
15.5 is O.K.
----- Original Message -----
From: "Paul Hunt" <paul.hunt1@blueyonder.co.uk>
To: "Jim Stuart" <jimbb88@comcast.net>; "Paul Root" <ptrmgb@gmail.com>; "The
Rays" <therays@ellijay.com>
Cc: "MG-V8 List" <mgb-v8@autox.team.net>
Sent: Thursday, October 25, 2007 4:30 AM
Subject: Re: Connecting a voltmeter
> 14.7v would be the absolute maximum for an alternator and only seen on
> some cars. Alternator maximum voltages can be as low as 14.3v. Dynamo
> equipped cars can range from 14.3 to 15.5v, and all those are maximum
> voltages i.e. with minimal load. When you start adding load it can easily
> go down to 13v and still be fine (anything above 12.8v). This is what I
> man about getting paranoid, and why fitting a voltmeter is often followed
> by fitting an uprated alternator, when the old system worked fine as it
> was. If you are getting a flat battery from driving, then other than
> having added lots of additional load you have a fault, not a deficiency of
> the original design.
>
> PaulH.
>
> ----- Original Message -----
>> For a 12 volt alternator, 14.7 volts would be a normal reading. Anything
>> less than 15.5 volts seems to be O.K. Less than 14 volts should be cause
>> for concern.
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