[DeTomaso] Best suitable source for fan wiring upgrade?

[Daryl Adams]

When I added the modern sucker fans to my car I just created a new circuit. I was replacing the water tubes under the spine, so I added a new conduit in there next to them. I then ran a new #10 wire with in-line fuse directly from the battery, through the conduit and up to up to the load side of a couple of new relays which I mounted where the original fan brackets had been. The original fan wires connected to the switch side of the relays, the new fans to the load side. Now there is plenty of good juice for the fans and minimal current going through the dash switch. The current isn't measured, but everything works well and I don't have to worry about the old wiring.

Daryl 


-----Original Message-----
From: steven.liebenow <steven.liebenow at att.net>
To: detomaso <detomaso at poca.com>
Sent: Mon, Mar 18, 2013 3:21 pm
Subject: [DeTomaso] Best suitable source for fan wiring upgrade?


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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