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.
The hot wire can be any switched source. The radio feed is a handy
connection.
----- Original Message -----
From: "Paul Root" <ptrmgb@gmail.com>
To: "The Rays" <therays@ellijay.com>
Cc: "MG-V8 List" <mgb-v8@autox.team.net>
Sent: Wednesday, October 24, 2007 3:12 PM
Subject: Re: Connecting a voltmeter
> You need a ground and a voltage source. You don't want to use the
> clock's power,
> as it's continuous. The voltmeter will wear your battery down. I just
> ran a wire
> from a switched terminal of the fusebox.
>
>
> I did this a couple of years ago, and the voltmeter was showing
> 15volts at speed,
> which disturbed me. But I never found anything to explain it.
>
> I put the clock back in.
>
> Last month, the alternator went out on me. Hmm. Could be.
>
> Paul.
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