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Scirocco-l Digest, Vol 16, Issue 68 (Gauges)

Yeah, but......
Personally, I like my gauge faces to match and I like the ammeter face to say "AMPS" and I don't want to have to do a mental conversion from the gauge number to the actual value.
Maybe I'm weird that way.

Maybe I should have said a VDO shunt ammeter costs about 4 times what a regular VDO ammeter costs. You know, something that I might buy and like to have in my Scirocco.

I agree with Gordon, that generally speaking an ammeter is pretty useless.
Dan

From: "Jason" <verboten@michiganvw.org>
Sent: Thursday, June 22, 2006 10:35 AM
Subject: Re: Scirocco-l Digest, Vol 16, Issue 68 (Gauges)


> exactly, all ANY meter is is a voltmeter, modified to measure what you want
> it to by way of voltage ;)
> 
> On 6/22/06, Brett Van Sprewenburg <brett@netacc.net> wrote:
>>
>>
>> You can build an ammeter with a shunt and a voltmeter.  The shunt
>> costs about $14.
>> Here's a 100AMP shunt:
>>
>> <http://www.allelectronics.com/cgi-bin/item/SNT-100/search/
>> 100_AMP_SHUNT,_50MV=100_AMPS_.html>
>>
>> Here's an appropriate meter to use "across" it, also $15:
>>
>> <http://www.allelectronics.com/cgi-bin/item/
>> PM-122/385/3.5_DIGIT_LED_PANEL_METER,_200_MV_.html>
>>
>> You could also use a DMM to on mV range to calibrate a standard VDO
>> voltmeter into amps to accomplish the
>> same thing for a more "portable" approach.
>>
>> ==Brett
>>
>>
>> On Jun 22, 2006, at 10:03 AM, Dan Bubb wrote:
>>
>> > So, a shunted ammeter uses a shunt!!! ;^)
>> > A shunt is a high current, low ohm resistor that is put in series
>> > between the battery and any load you want to measure.
>> > Then the meter is wired in parallel to the shunt. So, most of the
>> > current goes through the shunt but some of the current, in
>> > proportion to the ratio of the shunt resistance to the meter
>> > resistance, goes thru the meter.
>> > Sounds like a cleaner solution. Unfortunately, a shunted ammeter
>> > costs about 4 times what a normal ammeter costs!
>> > Does anybody care about this?
>> > Dan
>> >
>> >
>> > From: Dan Bubb" <jdbubb@verizon.net>
>> > To: "GGehrke" <ggehrke@gmail.com>
>> > Cc: <scirocco-l@scirocco.org>
>> > Sent: Thursday, June 22, 2006 9:39 AM
>> > Subject: Re: Scirocco-l Digest, Vol 16, Issue 68 (Gauges)
>> >
>> >
>> > This is my take on an ammeter. All the current needs to go through
>> > the ammeter for it to measure it. But, I doubt you'd want to
>> > measure the starter motor draw. That might be enough current to
>> > melt the ammeter and the wires that run to it. So, you need to
>> > leave the starter out of the ammeter circuit, but you want to
>> > include everything else including the alternator output.
>> > So only the starter motor would connect directly to the positive
>> > terminal of the battery. All the other connections to the + battery
>> > terminal would get moved to one side of the ammeter, the alternator
>> > output would be moved from the starter motor connection to the
>> > ammeter and the other side of the ammeter would connect to battery +.
>> > OTOH, there is something called a shunted ammeter. I have no clue
>> > how that works, but wouldn't mind finding out!
>> > Dan
>> >
>> > From: "GGehrke" <ggehrke@gmail.com>
>> > Sent: Thursday, June 22, 2006 9:08 AM
>> > Subject: Re: Scirocco-l Digest, Vol 16, Issue 68 (Gauges)
>> >
>> >
>> >>> Ammeter, you can tell if the Alt is charging correctly or not.
>> >>> The needle is centered at 0. When you turn the key or put on a
>> >>> load it swings to the left. When charging while the engine is on,
>> >>> it swings to the right.
>> >>
>> >> Ah, that makes sense now.  I have an ammeter gauge that I pulled at a
>> >> junk yard but wasn't sure how to hook it up because ammeters have to
>> >> go in series.  Surely I couldn't run the car's main power through it,
>> >> but I figured about the best usage of it would be to monitor some
>> >> arbitrary system like the headlights or something.
>> >>
>> >> But where exactly do you hook it up?  I'm assuming the blue exciter
>> >> wire, right?  Cause I know that's what causes the alternator light on
>> >> the dash to work...
>> >>
>> >>> Vacumn shows the manifold air pressure. Are you using a lot of
>> >>> fuel or running economically (or have a leak in the 25 YO rubber).
>> >>
>> >> My BMW has this and literally labels it a "MPG" gauge.  It's one of
>> >> those things that's just kinda interesting to watch.  I think I have
>> >> one for my scirocco that I'm going to install if I ever get around to
>> >> working on the car and not just school stuff :-/
>> >>
>> >> -Grant-
>> >>
>> >>
>> >>
>> >>>> -----Original Message-----
>> >>>> From: Chris Effinger [mailto:chriseffinger22@hotmail.com]
>> >>>> Sent: Saturday, June 17, 2006 12:52 AM
>> >>>> To: scirocco-l@scirocco.org
>> >>>> Subject: RE: Scirocco-l Digest, Vol 16, Issue 68
>> >>>>
>> >>>>
>> >>>>
>> >>>> has anybody put in aftermarket mechanical gauges ( water
>> >>>> temperature, oil
>> >>>> pressure)?, wondering if there's an easy way to do it. my 81s
>> >>>> originally had
>> >>>> some sort of electrical gauge
>> >>>>
>> >>>> _________________________________________________________________
>> >>>> Movies, Music & More! Visit Sympatico / MSN Entertainment
>> >>>> http://entertainment.sympatico.msn.ca/
>> >>>>
>> >>>>
>> >>>> _______________________________________________
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>> >>>>
>> >>>
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