RE: IML: Ammeter Gauge

["Dick Benjamin" <dickb@xxxxxxxxx>]

Sorry, I've been gone for about 10 days to visit family.

The ammeter gauge probably has been bypassed by a wiring mistake - it
appears that it is working, but current is not being routed through it.  The
only way to troubleshoot something like this is to take the wiring diagram
in the FSM and carefully follow the wires that are attached to the ammeter
to see what is connected to the wrong place.

I am surprised that your test light moved the needle, by the way, unless
your test light has a really high power bulb in it - the usual #1895 bulb
wouldn't budge the gauge, I don't think.  That may be a clue as to why the
gauge has been bypassed - namely that the internal shunt may be burned out,
and it has become way too sensitive.   If that is the case, your best bet is
to replace the gauge (or devise a replacement shunt, which I can help you
with), but you still have to find the wiring mistake and correct it to find
out what is going on with the gauge.

If you want to just ignore it, you can do so with no bad effects, you just
will have to pay attention to other signs that your charging system is not
up to snuff.  Probably the gauge sentry system will still work OK to warn
you if there is a problem - you are back to the old idiot light situation,
but still able to use the car.

Dick Benjamin

-----Original Message-----
From: mailing-list-owner@xxxxxxxxxxxxxxxx
[mailto:mailing-list-owner@xxxxxxxxxxxxxxxx] On Behalf Of Tim Durrer
Sent: Wednesday, November 22, 2006 4:50 PM
To: Imperial Mailing List
Subject: IML: Ammeter Gauge

The electrical gremlin's are still running amok under
the dash of my 73! Go all of my gauges working except
the Alternator. The wires on the back of the gauge are
tight,in good condition and have 12 volts on both of
them.

While I had the instrument panel out I connected a
wire from the black wire terminal on the back of the
gauge to the negative post of the battery. I then
connected my test light to the positive post of the
battery and touched it to the red wire terminal on the
back of the gauge. The gauge moved toward Discharge.
Gauge is working right? If I have 12 volts on both
wires in the dash why does it not work in the car?

Maybe Dick has run into this before.

Thanks,

Tim Durrer

73 Blue Sky

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