I don't know how the amp meter that I put in the TD works but
there is a device between the negative battery post and the body
and off that is a very small wire that goes to an electronic amp
meter which reads out amps being used as the starter turns but
after that it always reads 0. Never shows a charge though the
battery is being charged. The voltage meter part of it will show
anywhere from 11-14.4 volts depending on what is on and if the
motor is running or not. Sometimes with the lights, wipers, radio
and AC on it will only show about 13.5 or so which I think is to
be expected.
MG
Craig via Mercedes wrote:
On Wed, 4 Oct 2017 17:15:59 -0400 Dan Penoff via Mercedes
<mercedes@okiebenz.com> wrote:
Actually, you would use a CT, or current transformer. The meter would
only be say, 0-50 ma, and the CT could be a 100:1 ratio or something
like that.
Bzzzzttt!
A current transformer is for AC only!
Automotive electrical systems are 12 V DC.
A pretty common approach to reading and displaying high currents
without having to put the ammeter in series. In generator instrument
panels it was common to have an ammeter that was 0-5 amps with CTs of
250:1 or 500:1 driving it. That way you could display output current
and have low current in the instrument panel.
Yup.
Just don’t ever run a CT in a circuit with the secondary open. It will
destroy it.
Yup.
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