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The ammeter indicates the amount of current flowing. If the cars =
electrics and battery are taking more than the dynamo can provide, then =
the ammeter will be showing a discharge. If the engine revs are =
increased and this results in an increase in output from the dynamo, =
then the ammeter will indicate less of a discharge, and may move to show =
a charge. Similarly if more things are switched on, then if a charge =
was being indicated before, that may reduce or it may become a =
discharge. It all depends on how much current the cars electrics and =
battery are taking, compared with the dynamo output at the time.
Without the engine running i.e. no output from the dynamo switching =
anything - lights or ignition - on should show a discharge.
One needs to repolarise the dynamo after switch polarity or it will not =
charge. If the polarity was switched between connecting the ammeter one =
way, then the other, and wasn't repolarised in between, then that would =
explain why the ammeter moved in the same direction both times. =20
But if the ammeter connections were reversed independently of switching =
the polarity, as seems likely, then there is some other reason why it =
indicates in the same direction as before reversing the connections. =
Like the connections weren't actually reversed, of it was charging =
before but isn't now. If the engine wasn't even run, just turned on =
ignition or lights, then the connections weren't actually reversed.
PaulH.
----- Original Message -----=20
When engine revs increase, does the ammeter needle move farther?
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<DIV><FONT size=3D2>The ammeter indicates the amount of current =
flowing. If=20
the cars electrics and battery are taking more than the dynamo can =
provide, then=20
the ammeter will be showing a discharge. If the engine revs are =
increased=20
and this results in an increase in output from the dynamo, then the =
ammeter will=20
indicate less of a discharge, and may move to show a charge. =
Similarly=20
if more things are switched on, then if a charge was being =
indicated=20
before, that may reduce or it may become a discharge. It all =
depends on=20
how much current the cars electrics and battery are taking, =
compared=20
with the dynamo output at the time.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>Without the engine running i.e. no output from the =
dynamo=20
switching anything - lights or ignition - on should show a=20
discharge.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>One needs to repolarise the dynamo after switch =
polarity=20
or it will not charge. If the polarity was =
switched between=20
connecting the ammeter one way, then the other, and wasn't repolarised =
in=20
between, then that would explain why the ammeter moved in the same =
direction=20
both times. </FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>But if the ammeter connections were reversed =
independently of=20
switching the polarity, as seems likely, then there is some other =
reason=20
why it indicates in the same direction as before reversing the=20
connections. Like the connections weren't actually reversed, of it =
was=20
charging before but isn't now. If the engine wasn't even run, =
just=20
turned on ignition or lights, then the connections weren't actually =
reversed.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>PaulH.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; =
PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px"=20
dir=3Dltr>
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV> When engine revs increase, does the ammeter needle move=20
farther?</DIV></BLOCKQUOTE></BODY></HTML>
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