Re: [AMC-list] AMC-list Digest, Vol 12, Issue 31

[John Hughes <jchughes48114@xxxxxxx>]

Hi Jim,
There's a few AMC items I can contribute too and this is one of them. It's nice not lurking in the background.
The pulsing is caused by primitive voltage regulator in the gauge cluster. The regulator averages out pulses to ~ 5 volts. The fuel sending unit acts as a voltage divider and allows only so much current to the fuel gauge heating element, depending on the fuel level. The gauge needle is connected to a bi-metallic strip that heats up proportional to the fuel level. The heating causes the needle to move. Since the needle heating and cooling take place slowly, the gauge doesn't change much going up a hill. Pretty clever. I think AMC, Ford and Chrysler did it this way, GM used a magnetic coil. Anyway, that was back in the day.

John 
Brighton, MI



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Subject: AMC-list Digest, Vol 12, Issue 31

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Today's Topics:

  1. More Electrical (feltonjk@xxxxxxx)
  2. amx wiper conversion (tony)
  3. Re: More Electrical (Ken Ames)
  4. Re: More Electrical (Joe Fulton)
  5. Not done with  Freeze Plugs yet (Armand Eshleman)


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Message: 1
Date: Sat, 13 Mar 2010 12:31:02 -0500
From: feltonjk@xxxxxxx
To: amc-list@xxxxxxxxxxxx
Subject: [AMC-list] More Electrical
Message-ID: <8CC90EA16810EA5-51B8-C8BC@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
Content-Type: text/plain; charset="us-ascii"

More in my continuing saga of restoration of my 70 AMX.  Just got my gauges back from the shop, all gauges (temp/fuel) all lights, circuit board etc. have been checked and verified to be working.  New fuel sending unit installed a couple of years ago.  The sending unit is grounded to clean bare metal.  I thought I put in a new temp sending unit but am not 100% sure.  When I put a check light on the temp sending unit wire and on the fuel sending unit wire, the check light lights up indicating power through the harness to the connectors, but the test light blinks like a signal light!  It would appear as if I did something wrong somewhere along the way.  Have any of you run into this?  Help!!!!


Jim



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Message: 2
Date: Sat, 13 Mar 2010 09:58:01 -0800
From: "tony" <tonyis@xxxxxxxxx>
To: <amc-list@xxxxxxxxxxxx>
Subject: [AMC-list] amx wiper conversion
Message-ID: <C4490BFB158D46839D6493957002FE53@DHTRGQB1>
Content-Type: text/plain; charset="iso-8859-1"

Dear Joe.

Thank you for the information.
I just joined my local AMC club. I will ask them for the remaining parts.

Tony
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Message: 3
Date: Sat, 13 Mar 2010 11:36:55 -0700
From: Ken Ames <ameskg@xxxxxxxxx>
To: "AMC, Rambler, Nash, Jeep and family" <amc-list@xxxxxxxxxxxx>
Subject: Re: [AMC-list] More Electrical
Message-ID: <1268505415.4b9bdb4721bd7@xxxxxxxxxxxxxxxxxxxxxxx>
Content-Type: text/plain; charset=ISO-8859-1

At first glance this looks like the dash voltage regulator is working as it
should. The on-and-off puts an average 5 or so volts to the gauges which is
correct, AFAIK.

Ken


Quoting feltonjk@xxxxxxx:

> More in my continuing saga of restoration of my 70 AMX.  Just got my gauges
> back from the shop, all gauges (temp/fuel) all lights, circuit board etc.
> have been checked and verified to be working.  New fuel sending unit
> installed a couple of years ago.  The sending unit is grounded to clean bare
> metal.  I thought I put in a new temp sending unit but am not 100% sure. 
> When I put a check light on the temp sending unit wire and on the fuel
> sending unit wire, the check light lights up indicating power through the
> harness to the connectors, but the test light blinks like a signal light!  It
> would appear as if I did something wrong somewhere along the way.  Have any
> of you run into this?  Help!!!!
> 
> 
> Jim
> 
> 
> 
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Message: 4
Date: Sat, 13 Mar 2010 11:38:23 -0800 (PST)
From: Joe Fulton <piper_pa20@xxxxxxxxxxx>
To: Rambler Nash Jeep and familyAMC <amc-list@xxxxxxxxxxxx>
Subject: Re: [AMC-list] More Electrical
Message-ID: <870390.14366.qm@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
Content-Type: text/plain; charset=iso-8859-1

Ken' right I think.  Jim the tank sender doesn't acually have a power wire going to it.  The gauge picks up return current from the ground circuit of the car.  The resistance produced by the sender mechanism changes the voltage (read as fuel level) shown on the fuel gauge.  So what you were evidently reading with your volt meter was the 5-volt nominal reference voltage produced for the guages.  It's produced by a primitive convertor with start/stop action to produce an average of 5 volts.

Joe Fulton

--- On Sat, 3/13/10, Ken Ames <ameskg@xxxxxxxxx> wrote:

> From: Ken Ames <ameskg@xxxxxxxxx>
> Subject: Re: [AMC-list] More Electrical
> To: "AMC, Rambler, Nash, Jeep and family" <amc-list@xxxxxxxxxxxx>
> Date: Saturday, March 13, 2010, 10:36 AM
> At first glance this looks like the
> dash voltage regulator is working as it
> should. The on-and-off puts an average 5 or so volts to the
> gauges which is
> correct, AFAIK.
> 
> Ken
> 
> 
> Quoting feltonjk@xxxxxxx:
> 
> > More in my continuing saga of restoration of my 70
> AMX.? Just got my gauges
> > back from the shop, all gauges (temp/fuel) all lights,
> circuit board etc.
> > have been checked and verified to be working.?
> New fuel sending unit
> > installed a couple of years ago.? The sending
> unit is grounded to clean bare
> > metal.? I thought I put in a new temp sending
> unit but am not 100% sure. 
> > When I put a check light on the temp sending unit wire
> and on the fuel
> > sending unit wire, the check light lights up
> indicating power through the
> > harness to the connectors, but the test light blinks
> like a signal light!? It
> > would appear as if I did something wrong somewhere
> along the way.? Have any
> > of you run into this?? Help!!!!
> > 
> > 
> > Jim
> > 
> > 
> > 
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> > AMC-list mailing list
> > AMC-list@xxxxxxxxxxxx
> > http://list.amc-list.com/listinfo.cgi/amc-list-amc-list.com
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> 
> 
> _______________________________________________
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Message: 5
Date: Sat, 13 Mar 2010 13:47:51 -0600
From: "Armand Eshleman" <aje1@xxxxxxxxxxxxxxx>
To: "AMC, Rambler, Nash, Jeep and family" <amc-list@xxxxxxxxxxxx>
Subject: [AMC-list] Not done with  Freeze Plugs yet
Message-ID: <009201cac2e6$127981a0$04fea8c0@xxxxxxxxxxxxxx>
Content-Type: text/plain;    charset="iso-8859-1"

Frank said "They plug the holes used to pour molten steel or aluminum into
the mold for the block (or head). "

I said
As long as we are being really anal about "freeze" plugs, and because it was
mentioned we like to learn things on this list, and because it was mentioned
about getting a lecture or something like that, I guess I better add my
coins to the discussion.
Actually the "holes" that the plugs fill are NOT where the molten metal is
poured into the mold. The holes filled with "freeze/welch/core" plugs (I've
heard them referred to as soffit plugs too) is actually the hole that the
sand is removed from. The molds that cast iron blocks are poured with is
made of casting sand. There I said it and I'm done.

Armand

----- Original Message ----- 
From: "Frank Swygert" <farna@xxxxxxx>
To: <amc-list@xxxxxxxxxxxx>
Sent: Friday, March 12, 2010 5:47 PM
Subject: Re: [AMC-list] Aluminum 195.6 Freeze Plugs


> Just a little nit to pick here!! Those are Welch plugs or core plugs, NOT
"freeze plugs", though that's what they are commonly called. They ARE NOT to
protect the block from freezing. >
> I don't know how the term "freeze plug" came into being, but it's firmly
entrenched into automotive lore more than "Ramblers were made from parts
bought from other US car makers". Some lucky guy went out and found one or
two popped out when his engine froze, I guess, or people were just guessing
to begin with. I have YET to see ANY auto maker's technical literature refer
to one as a "freeze plug", nor any engineering papers. It's an "old
mechanic's tale", and if the plugs popped out and the block wasn't damaged
due to freezing you're one lucky SOB!!
>
> --------------
> Date: 12 Mar 2010 07:46:15 -0000
> From: das24rules@xxxxxxxxx
>
> wow, im not sure what the screws are for. my freeze plugs look like the
day
> they were new. i wasnt going to bother with new ones. i saw that feebay
add,
> and thought about it for like 1 second, (till i saw it was only 1) and
> decided to pass. the car this came out of only had 15k on it. appeared to
be
> draind before parked. it would be nice to have NEW ones availible. yes,
they
> are friggin HUGE. i havent measured them, but probbly over 2". real close
if
> not. i guess maybe it needs to be for the cold climates (like where i live
> where it is -20 regularly in the winter, 5 days in a row this winter) to
make
> that the weakest point with all that aluminum.
>
> -- 
> Frank Swygert
> Publisher, "American Motors Cars"
> Magazine (AMC)
> For all AMC enthusiasts
> http://farna.home.att.net/AMC.html
> (free download available!)
>
> _______________________________________________
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>
>
> -- 
> Internal Virus Database is out-of-date.
> Checked by AVG.
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6:16 AM
>
>



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