[DeTomaso] cooling fan blowing fuse

[Tomas Gunnarsson]

That's a valid point Doug. Since the 15 A fuse blew I took for granted that
a meter capable of more than 10 A was to be located. I know that Fluke
meters use ridiculously expensive fuses, my private multimeters use ordinary
(cheap) glass fuses though. :-)

Tomas

-----Original Message-----
From: detomaso-bounces at realbig.com
[mailto:detomaso-bounces at realbig.com]On Behalf Of doug351c
Sent: den 1 november 2010 03:28
To: Tomas Gunnarsson; detomaso at realbig.com
Subject: Re: [DeTomaso] cooling fan blowing fuse


Most DVM's (digital voltmeters) only read to 10A but Brian was blowing 15A
fuses.  That's why I recommended the fuse blowing method of figuring out how
much current is flowing.  Also, the higher end DVM's have current fuses that
are quite expensive so you don't want to connect them to a current that
exceeds their capacity.

Doug Braun
blue 723L #5505

-----Original Message-----
From: detomaso-bounces at realbig.com
[mailto:detomaso-bounces at realbig.com]On Behalf Of Tomas Gunnarsson
Sent: Sunday, October 31, 2010 1:34 PM
To: detomaso at realbig.com
Subject: Re: [DeTomaso] cooling fan blowing fuse


Instead of comparing which size fuses blow or not, get an ammeter and
measure the actual current used by one fan at a time. The fact that a fan
spins doesn't mean it's not damaged and it may be using more current than
normal.

Tomas

-----Original Message-----
From: detomaso-bounces at realbig.com
[mailto:detomaso-bounces at realbig.com]On Behalf Of Brian Hill
Sent: den 31 oktober 2010 21:58
To: SCPOCA at yahoogroups.com; detomaso at realbig.com
Subject: Re: [DeTomaso] cooling fan blowing fuse


Okay, performed the test with a 15 fuse inline to the power source.
performed
separate test on each fan and fuse did not blow. (tried it multiple times)
I
cleaned the terminals with an electrical cleaner and plugged everything back
together as normal.  For grins, I tried the manual switch with the key to
the On
position...hit the switch, no problems.   On/off, On/off...did not blow.
Before
you could just hit the switch and it would pop.


Next step, took car out for quick run to get temps up.  Temps got up, pulled
over to verify that Temp Controlled fan was running.  Hit the Manual fan
switch
and the fuse blew.

So, what I learned is that both fans cannot be running at the sametime.  But
unfortunately, that is all I learned.  The fans had been running just fine
until
recently so something has changed.


Feel free to chime in.

thanks,
Brian
01642

________________________________
From: doug351c <doug351c at gmail.com>
To: Brian Hill <mazdastuff at yahoo.com>; SCPOCA at yahoogroups.com;
detomaso at realbig.com
Sent: Sat, October 30, 2010 8:04:57 PM
Subject: RE: [DeTomaso] cooling fan blowing fuse

Brian,

What amp rating fuse are you using?  And how fast is it blowing?  My info
shows it should be a 15A for fuse #11 on a 1971.  Since you have no trouble
using fuse 11 and its relay to drive the other fan, that says that that
portion of the wiring is OK.  To see if the motor is drawing too much
current, directly connect the fan to the battery through a 15A fuse.  Be
sure to connect both the hot and the ground wire in this test or the fan
won't run.  If the fuse blows, try a 20A fuse.  If the 20A fuse doesn't
blow, the Pantera's fan wiring is good for using a 20A fuse so go ahead an
use it.  If the 20A fuse blows, get a new fan motor.

Doug Braun
blue 73L #5505

-----Original Message-----
From: detomaso-bounces at realbig.com
[mailto:detomaso-bounces at realbig.com]On Behalf Of Brian Hill
Sent: Saturday, October 30, 2010 4:00 PM
To: SCPOCA at yahoogroups.com; detomaso at realbig.com
Subject: [DeTomaso] cooling fan blowing fuse


I have a 71 model early.  Has manual cooling fan switch.  Recently I hit the
switch and fuse #11 blows disabling the manual fan.  I tried checking the
fan
operation by using some jumper wires (recommended by Dave Bell) and the fan
runs
like a champ.  does not bind or spin slowly.  So I tried switching fans,
plugged
in the other fan to the harness for the manual and I hit the switch.....fuse
did
not blow.  Tried it multiple times and it works fine.


Question:  is the fan simply drawing too many amps thus blowing the fuse but
still operational?


Brian
01642



_______________________________________________

Detomaso Forum Managed by POCA

Archive Search Engine Now Available at http://www.realbig.com/detomaso/

DeTomaso mailing list
DeTomaso at list.realbig.com
http://list.realbig.com/mailman/listinfo/detomaso

_______________________________________________

Detomaso Forum Managed by POCA

Archive Search Engine Now Available at http://www.realbig.com/detomaso/

DeTomaso mailing list
DeTomaso at list.realbig.com
http://list.realbig.com/mailman/listinfo/detomaso

_______________________________________________

Detomaso Forum Managed by POCA

Archive Search Engine Now Available at http://www.realbig.com/detomaso/

DeTomaso mailing list
DeTomaso at list.realbig.com
http://list.realbig.com/mailman/listinfo/detomaso