[DeTomaso] radiator fan connection

[Christopher Kimball]

I think I may have mentioned this on the forum before, but after having some cooling problems, I wired in small LEDs to each of the fans' power wires, right at the fan motor, and mounted each LED in the dash.  When the fans are running, the LEDs illuminate so I can be sure there is power going to each fan.

I noticed once while driving at night that the LEDs were glowing mysteriously.  I realized since it was cool and the fans were off, that the airflow was spinning the fans backward, and generating some current, as described below!

Chris
#3846

> From: detomasoregistry at gmail.com
> To: deserttwist at juno.com
> Date: Sat, 6 Mar 2010 13:06:01 -0800
> CC: detomaso at realbig.com
> Subject: Re: [DeTomaso] radiator fan connection
> 
> The diode is there to keep current from flowing back thru the circuit when not desired,
> so keep the diodes in place.
> 
> The diode is like a one-way door.  The arrow or triangle points in the direction it
> will allow electron flow.
> 
> This is what has happened to some without a diode.
> 
> They are driving along (hot enough for the fan(s) to be running).  They stop and shut off
> the key, but the engine keeps running!!!
> 
> What has happened is that the rotating fan acts as a generator, and converts magnetic
> energy (in general terms - don't jump on me here electrical gurus) to electrical current,
> that flows back to the system and continues to energize the ignition system, keeping the
> engine running...
> 
> Chuck
> 
> 
> Hi all ,Sue back here still trying to get our car together. I will say it is all painted
> and the motor on fire up stand just waintin to jump in there. One hold up, we bought a new
> fluidyne radiator and on the left wiring Blue-Black there is some kind of diode or
> resister , on the Blue wire. I think the nbr on it is FCG5986? On the passenger side ther
> is a Yellow wire with a diode or resister also. They are cylinderal, about 1/2 inch long
> and 3/8 inch dia. What would be the best way to wire in the new 16" fan. We do have the
> original thermostats/ upper & lower.  Should we get rid of the old system and start over.
> A diagram would help. Thanks Sue and Darrell
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