[DeTomaso] Factory Shunt? was Re: Ammeter, was Re: Key difficult to turn

Charles McCall charlesmccall at gmail.com
Tue Oct 16 10:01:53 EDT 2012


I'm going by memory, something dangerous, but I thought that on the
forum a few years back we had this conversation and discovered that
the later meters had an internal shunt to perform the same function...

On 10/16/12, cengles at cox.net <cengles at cox.net> wrote:
> Dear Thomas,
>
>
>
>                    I don't recall a factory external shunt on the
> ammeters on my two July 1974 Panteras, either.
>
>
>                                    Warmest regards, Chuck Engles
>
>
> On Tue, Oct 16, 2012 at 12:59 AM, Thomas Tornblom wrote:
>
>> No external shunt on my stock Veglia ammeter, 1984 GT5.
>>
>> Thomas
>>
>> 2012-10-16 04:40, MikeLDrew at aol.com skrev:
>>>
>>> In a message dated 10/15/12 17 43 23, guido_detomaso at prodigy.net
>>> writes:
>>>
>>>
>>>> There was a factory shunt?  Guess I missed a few episodes here...my
>>>> car
>>>> is a '73
>>>> though.
>>>>
>>>>>> Check out this photo:
>>>
>>> http://www.poca.com/index.php/gallery/?g2_itemId=38308
>>>
>>> The interesting part (the shunt) is unfortunately a bit out of focus.
>>> This is a NOS ammeter that I lifted out of a Ford box.   It's my
>>> understanding
>>> that this external shunt was standard.   I think the ammeter in my
>>> '72 also
>>> has this shunt installed.   Note that it's electrically hot all the
>>> time and
>>> completely lacking any insulation.   DOH!
>>>>
>>>>> The shunt I took off I made long ago, before the internet.  The
>>>>> needle
>>>> stopped
>>>> moving over time, something I wanted to address.  But a shunted
>>>> gauge with
>>>> a
>>>> non-moving needle beats walking home.
>>>>
>>>>>> Indeed.
>>>>
>>>>> And so am starting to question the wisdom of this whole project.
>>>>
>>>>>> As am I.   I suspect your original shunt was too shunty; that is,
>>>>>> too
>>> much power was going past the gauge instead of through it.   You can
>>> see the
>>> original one is just a thin piece of brass.
>>>
>>>
>>>>> Has anyone
>>>> used the existing red wire off the ignition switch, that powers
>>>> everything(?)
>>>> that goes on and off with the key, to only trip a relay, switching
>>>> power
>>>> from a
>>>> new third wire off the ammeter?
>>>>
>>>>>>> I *think* that this is the scheme that Rick Moseley's relay kit
>>>>>>> uses,
>>> although he ties into the fusebox, not the ignition switch.   But I
>>> think what
>>> he does is have you unplug the red wire (that goes from the ignition
>>> switch
>>> to the fusebox) and plug it into one of his wires, which then goes to
>>> a
>>> relay, and the output from the relay then goes to the fusebox where
>>> the
>>> original red wire hooked up.   I *think*.
>>>
>>>>> Taking just the fan current out of the ignition switch doesn't take
>>>>> all
>>>> the
>>>> current away, as I'm finding out.
>>>>
>>>>>> True dat.   But it certainly removes the largest consumers...
>>>
>>> Mike
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>>
>>
>> --
>> Real life:   Thomas Törnblom             Email:	   thomas at hax.se
>> Snail mail:  Banvallsvägen 14            Phone:    +46 18 32 31 18
>>              S - 754 40 Uppsala, Sweden  Mobile:   +46 76 209 8320
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