[DeTomaso] Electrical question

[Thomas Tornblom]

bill gaino skrev:
> Not so hokey.  If your battery was compltely dead. !00 amps through the factory wire from the alt to batt, my get hot or even  melt. By adding another wire, your able to handle the higher load. Basicly your just paralleling the wires. They both end at the battery.The factory wire just runs through the amp gauge.When I added an extra fuse box under the hood on 1362 for my dual a/c fans and the front SPAL fans I ran a 10 gage wire straight from the alt to the box, This circut has the amp gage on it, and I can monitor my power consumption used by the fans...One wire alternator is the way to go in my opinion. 

Connecting one wire from the alt to the battery, bypassing the ammeter, 
will render the ammeter less than useless IMHO.

The ammeter may show less than the actual charging current, but it may 
also show that it is discharging when you switch on some heavy 
consumers. Part of the current will then go from the alt, directly to 
the battery, and then through the ordinary wiring through the ammeter to 
the consumer, and for the ammeter it will look as the current is coming 
from the battery, when it in fact is coming from the alt.

I would say +1 on the "hookey" part. I'm surprised that people at 
Powermaster would recommend this.

You could connect a parallel wire from the alt to the ammeter, and 
another one from the ammeter to the battery.

If you suspect that the ammeter won't handle the power, you can connect 
a medium sized wire as a shunt across the ammeter. That will make it 
move less, and it won't be accurate, but it will at least move in the 
right direction, which it won't with the suggested wiring.

Thomas

> 
> -----Original Message-----
>> From: MikeLDrew at aol.com
>> Sent: Mar 4, 2010 7:34 PM
>> To: detomaso at realbig.com, Johnnyrwoods at aol.com
>> Subject: [DeTomaso] Electrical question
>>
>> Hey Bill Taylor and other electrically smart people,
>>
>> Johnny Woods asked me to ask a question on his behalf.   He's installing a 
>> Powermaster 100-amp alternator on his car; he bought a one-wire model but 
>> now wants to convert it to three-wire operation.   He talked to the 
>> Powermaster tech line and they told him it wasn't possible, which I find difficult to 
>> believe.
>>
>> At the same time, they told him that the factory wiring wasn't up to the 
>> task of handling 100 amps, and advised him that he should run TWO power wires 
>>from the alternator; the second should run from the alternator output 
>> directly to the battery cable on the starter solenoid (and thence back to the 
>> battery).
>>
>> Their premise is that by doing so, a percentage of the alternator's output 
>> would run through the ammeter, to the battery, while the rest would bypass 
>> the ammeter.
>>
>> This sounds totally hokey to me, and completely unnecessary.   What say 
>> you, electrically smart people?
>>
>> Please, please hit 'reply all' so your replies will be seen by Johnny, who 
>> is on the PI forum but not this one.
>>
>> Thanks!
>>
>> Mike
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-- 
Real life:   Thomas Törnblom             Email:  Thomas.Tornblom at Hax.SE
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