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Bulletproof fan switch

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Old Apr 22, 2008 | 09:27 AM
  #1  
valter's Avatar
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From: Leesburg, VA
Bulletproof fan switch

Just wanted to share. Installed a manual fan switch over this weekend on my '96 (thanks shoebox!!!):
http://shbox.com/1/fan_sw_diagram2.jpg
Right after installation, I suddenly realized that I will end up with dead battery one day at work 60 miles away from home, as I will forget to switch off fans when car is off.
My solution: I added relay. On diagram, normally opened relay contacts splices "Chassis Ground" connection. Relay is being energized from Red wire which goes to CD player (switchable power).
Old Apr 22, 2008 | 10:35 AM
  #2  
TeamingTealZ28's Avatar
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Joined: Mar 2008
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From: East Meadow, NY
I leave my fans on the all the time.

Well never when its on high cause you gotta be dumb to not hear that.

But low..gets tricky..somtimes i look back at the car cause i hear it, its really low
Old Apr 22, 2008 | 11:38 AM
  #3  
10secbuick's Avatar
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From: deployed- southwest asia
if you had spliced the fan switch into the relays in the first place you'd never have to worry about leaing it on...
Old Apr 22, 2008 | 01:10 PM
  #4  
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Originally Posted by 10secbuick
if you had spliced the fan switch into the relays in the first place you'd never have to worry about leaing it on...
No, he did it right.
96-97s have power to the fan relays hot all the time. 93-95s go off with the key.

Looks like he added a relay to kill the ground used by the fan switch when then key is off. That way the fans will go off, even if the switch is left on.
Old Apr 23, 2008 | 11:06 AM
  #5  
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From: High Ridge, MO
I agree w/shoebox on this, on my firehawk, even using SLP's switch they would stay on if the switch was on (both hi or low), and on my 95 and 93, they are off when the key is off. Good job though regardless.
Old Apr 23, 2008 | 01:26 PM
  #6  
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From: deployed- southwest asia
i didnt realize there was a difference in the years, my bad.

in that case, good thinking!
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