[DeTomaso] Best suitable source for fan wiring upgrade?

[SOBill at aol.com]

IMHO,
 
All loads in the car, except the starter motor, should come  thru the 
ammeter. Connect a heavy wire to the ammeter terminal which does not go  to the 
battery. See:
_http://www.panteraplace.com/Electrical/Ammeter%20Wiring.jpg_ 
(http://www.panteraplace.com/Electrical/Ammeter%20Wiring.jpg) 
 
If you connect the fan power cable to the battery terminal of the  ammeter, 
the ammeter will indicate the current going to the fans as if it were  
charging the battery.
 
The current drawn by the fan will be very high when the fan starts  and 
then the current will drop down when the fan comes up to speed. The current  
draw when the fan is running will depend on how much air it is  moving ...... 
i.e. the load on the motor.
 
The main  thing is to keep the main thing the main thing.

Do the best you can with  what you have where you are.

Have fun today,

sobill at aol.com  

 
In a message dated 3/18/2013 1:21:14 P.M. Pacific Daylight Time,  
steven.liebenow at att.net writes:

All,


Working on upgrading my current draw for  fans....and see a few different 
options.  Was throwing this out for  feedback on the most sound method of 
doing 
this....

Options
1)  Extend a new wire from the back of the AMP gauge in the dash, out to 
the  
front fan area, and then feed relays.....normal thing.   #10 has  been 
mentioned...
2) Run wire from battery terminal on starter relay up  to front.....relays 
again....
3) Run wire from rear of alternator  output or from regulator output up 
front....relay thing......


I  believe that I am going to be drawing about double what I had  
previously.  
Using an old Stewart Warner gauge...no idea how  accurate, I measured a 6A 
draw 
on my old fans, and an 8-10 on the new  fans.   Paperwork says that they 
are 25A 
fans  (Derale)......each.    My amp meter only went up to 10A and I didn't  
feel 
like blowing fuses trying to figure out if they draw more than  10A......so 
let's 

just say that they do......for sake of  discussion.....

Issues: 
0) It would be nice to have the gauge read  actual draw.  I don't believe I 
would 

get that with options 2  & 3 above.
1) I am concerned about loading on the gauge.
2) I am  concerned about loading on the wiring to the gauge.    I do not  
recall 
which relay etc feeds the gauge or if it comes directly from the  ignition 
switch....need to spend time in the Italian schematics.....(this  is on a 
Goose!)
3) I am concerned about running a hot lead up thru the  chassis......but 
have 50A 

fuses available.....that I would put on the  source end in the event of 
something 

bad happening that would pinch  the wire.

Just interested in hearing pro's and con's  here.......

Thanks!
Steve
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