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

[cengles at cox.net]

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
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