[DeTomaso] Cooling fan light

[Mike Drew]

Mike,

It’s VERY easy to fix!

You accurately describe the situation—when the fans are now drawing power (working), they act like turbines and airflow generates power which causes the light to glow dimly. What you need to do is ground the fans directly to the body, using diodes (which are electrical one-way valves). 

This eBay seller has them, and they work great. I’ve purchased dozens of them from him for people over the years. 

https://www.ebay.com/itm/325194863783?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=p0aKGuDEQFe&sssrc=2349624&ssuid=yOodP4aXT3u&var=&widget_ver=artemis&media=COPY

This is for a set of four (inky two needed). His price for two is almost the same so I always get four and pass the unneeded ones on. 

In practice, I drill a hole in the fan mounting bracket right behind the grille, alongside and underneath the fan, and bolt the diode there (after scraping away the paint to ensure a good ground). The ground wire from the fan normally connects to the harness. Simply unplug it, attach a suitable connector and hook it to the diode. It’s a matter of a few minutes. 



As an added benefit, this will cure cars with ‘sensitive’ ignition systems like MSD, where the feedback from the fans can keep the box powered after the ignition switch is turned off, and cause the engine  to run on for a few seconds until the fans spin down and stop producing power.

Finally, the ground path through the stock harness is a long and tortured one. Although others have said it with conviction, I can’t prove that the fans will spin faster/work better if grounded locally like this. 

But I believe it….

Mike

Sent from my iPad

> On Jun 7, 2022, at 16:55, Mike McDougal <mdmcdougal at gmail.com> wrote:
> 
>    Is there a way to stop the cooling fan motors from backfeeding to the
>   fan light ? At highway speed the wind spins the fans and lights the fan
>   light when the fans arent powered up.A  I hope i explained this well
>   enough. Other than that, i have no complaints about my coolingA system.
>   Thanks, Mike #3482
> _______________________________________________
> 
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   Mike,

   It's VERY easy to fix!

   You accurately describe the situation--when the fans are now drawing
   power (working), they act like turbines and airflow generates power
   which causes the light to glow dimly. What you need to do is ground the
   fans directly to the body, using diodes (which are electrical one-way
   valves).

   This eBay seller has them, and they work great. I've purchased dozens
   of them from him for people over the years.

   [1]https://www.ebay.com/itm/325194863783?mkcid=16&mkevt=1&mkrid=711-127
   632-2357-0&ssspo=p0aKGuDEQFe&sssrc=2349624&ssuid=yOodP4aXT3u&var=&widge
   t_ver=artemis&media=COPY

   This is for a set of four (inky two needed). His price for two is
   almost the same so I always get four and pass the unneeded ones on.

   In practice, I drill a hole in the fan mounting bracket right behind
   the grille, alongside and underneath the fan, and bolt the diode there
   (after scraping away the paint to ensure a good ground). The ground
   wire from the fan normally connects to the harness. Simply unplug it,
   attach a suitable connector and hook it to the diode. It's a matter of
   a few minutes.

   image0.jpeg

   As an added benefit, this will cure cars with `sensitive' ignition
   systems like MSD, where the feedback from the fans can keep the box
   powered after the ignition switch is turned off, and cause the engine
   to run on for a few seconds until the fans spin down and stop producing
   power.

   Finally, the ground path through the stock harness is a long and
   tortured one. Although others have said it with conviction, I can't
   prove that the fans will spin faster/work better if grounded locally
   like this.

   But I believe it....

   Mike

   Sent from my iPad

     On Jun 7, 2022, at 16:55, Mike McDougal <mdmcdougal at gmail.com>
     wrote:

     Is there a way to stop the cooling fan motors from backfeeding to the
     fan light ? At highway speed the wind spins the fans and lights the
   fan
     light when the fans arent powered up.A  I hope i explained this well
     enough. Other than that, i have no complaints about my coolingA
   system.
     Thanks, Mike #3482
   _______________________________________________
   Detomaso Email List is not managed by POCA
   Posted emails must not exceed 1.5 Megabytes
   DeTomaso mailing list
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   To manage your subscription (change email address, unsubscribe, etc.)
   use the links above.
   Members who post to this list grant license to the list to forward any
   message posted here to all past, current, or future members of the
   list. They also grant the list owner permission to maintain an archive
   or approve the archiving of list messages.

References

   1. https://www.ebay.com/itm/325194863783?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=p0aKGuDEQFe&sssrc=2349624&ssuid=yOodP4aXT3u&var=&widget_ver=artemis&media=COPY
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