[DeTomaso] New Owner Questions, Help

[Thomas Tornblom]

F&D Terry skrev:
> Mike,
> 
> All automobile ammeters already have an internal shunt otherwise their 
> delicate meter circuit would be instantly destroyed. The shunt is 
> usually brass and of a known cross section so that the amount of current 
> bypassing the meter circuit can be calculated. The minuscule current 
> that does go through the meter coils causes it to move a precise amount 
> and thus register the amps. Placing a second shunt across the meter 
> terminals may cause the meter to cease functioning depending on its 
> cross sectional area.
> 
> There is no good reason to add a second shunt. If the meter terminals 
> are clean and tight it will operate as intended. I ran a 120 amp 
> alternator on my car for years that supplied the heavy current demands 
> of an electronic fuel injection without an incident. There are those who 
> advocate shunting the ammeter but to me it is a useless endeavor.

For those who are electrically challenged, make sure you do not attach 
any heavy consumers like the cooling fans or headlights directly to the 
battery, as the current to these will then have to go through the 
ammeter. This will make the meter indicate a heavy charging, when in 
fact you could be draining your battery, it will put unnecessary stress 
on the meter and wiring and the output to the consumers will be lower 
than needed, resulting in less light or cooling.


> 
> Take a look at http://www.allaboutcircuits.com/vol_1/chpt_8/4.html
> 
> Fred T.

Thomas

> 
> MikeLDrew at aol.com wrote:
> 
>> In a message dated 7/4/07 19 10 55, asajay at asajay.com writes:
>>
>>
>>  
>>
>>> - Short the Ammeter
>>>    This one is a matter of who you talk to.  Shorting the ammeter
>>> prevents it from heating up and catching fire (don't let that scare you
>>> though, it's not a -real- problem). 
>>>
>>>    
>>>
>> AJ means SHUNTING tha ammeter.   Shorting it will instantly cause a fire. :>)
>>
>> Running a wire from one side of the ammeter to the other (a shunt) allows 
>> some of the current to flow past the ammeter, instead of through it.   This does 
>> two things--it ensures the car will still run if the ammeter dies internally, 
>> and it also helps dampen the wide fluctuations you might otherwise see.
>>
>> SOBill Taylor (SOBill at aol.com) is the resident electrical guru here, and he 
>> should be chiming in with help any moment now. :>)
>>
>> MIke
>>
>>
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Real life:   Thomas Törnblom             Email:  Thomas.Tornblom at Hax.SE
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