[DeTomaso] [SCPOCA] Re: cooling fan blowing fuse

Brian Hill mazdastuff at yahoo.com
Tue Nov 2 22:14:04 EDT 2010


Thanks everyone.  Once again the input from the Pantera group is greatly 
appreciated.

I intend to fully rewire the fans and separate their placement on the fuse panel 
but first I want to find
the trouble spot in the wiring.  Just want to make sure there are no more 
surprises.  


Lets close this thread.  I'll probably start a new one on "Electrical Shorts, 
garments that put a spring in your step" or "Automotive Demons that possess your 
car and how to drive them out".   (yep, pun intended)

Thanks again to all.
Brian




________________________________
From: Brian Hill <mazdastuff at yahoo.com>
To: SCPOCA at yahoogroups.com
Sent: Tue, November 2, 2010 7:22:27 PM
Subject: Re: [SCPOCA] Re: [DeTomaso] cooling fan blowing fuse

  
I do believe it has come down to a wiring issue.  I think the gauge is correct 
but it is starting to look like a short in the wiring.

Brian



________________________________
From: Dennis Jones D.C. <drjoneschiro at sbcglobal.net>
To: SCPOCA at yahoogroups.com
Sent: Tue, November 2, 2010 4:05:00 PM
Subject: RE: [SCPOCA] Re: [DeTomaso]  cooling fan blowing fuse

  
Is your wiring large enough to handle going to a 30 amp fuse????  Just a shot in 
the dark from here…LOL
 

________________________________
 
From:SCPOCA at yahoogroups.com [mailto: SCPOCA at yahoogroups.com ] On Behalf Of Brian 
Hill
Sent: Tuesday, November 02, 2010 3:56 PM
To: detomaso at realbig.com; SCPOCA at yahoogroups.com
Subject: [SCPOCA] Re: [DeTomaso] cooling fan blowing fuse
 
  
Thanks for verifying that.  I have learned to remove the passenger side seat.  
Makes it easier to get up there.

I have acquired a clamp on ammeter from sears.  when I apply power to either 
motor the amp readings start at 17 and go down to 10.  So now I ask...is that 
normal?
Keeping in mind that I have aftermarket high volume fans.  

Brian


 

________________________________
 
From:"MikeLDrew at aol.com" <MikeLDrew at aol.com>
To: mazdastuff at yahoo.com; SCPOCA at yahoogroups.com ; detomaso at realbig.com
Sent: Mon, November 1, 2010 9:17:47 PM
Subject: Re: [DeTomaso] cooling fan blowing fuse


In a message dated 11/1/10 19 02 19, mazdastuff at yahoo.com writes:




Thanks Doug, Orville, and J.  Looks like I have some work ahead of me.  Oh well,
weather is getting cooler so it will be more fun to work on.  J mentioned some
relays that might also be damaged due to the way they are mounted on the car.  
I am aware of the cooling fan relays under the dash on the passenger side.   Are
there others mounted in the front?


The later cars (1972 and later) mounted the fan relays immediately behind the 
radiator on the passenger side, attached to the front of the front trunk 
compartment sheetmetal.  The 1971 cars like yours mounted these same relays on 
the relay panel under the dash, behind the glovebox.

There is no philosophical distinction; the relays function exactly the same in 
either case.  There's no risk of damage by having them in the cabin; they are 
just less convenient to work on.

The later cars powered the fans by fuses #11 and #12; #11 was 15 amp and #12 was 
25 amp (it also had some other jobs to handle at the same time).  The early 
wiring diagram shows both fans powered by a single fuse (it appears to be fuse 
#14, which would be one of the window fuses?); I don't see a fuse power rating 
listed however.

Methinks your problems may be associated either with more-powerful fans, or fans 
that are degraded and thus have a higher-than-normal amperage draw, combined 
with the flawed philosophy of powering both fans on the single fuse?

Mike
 

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