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  #226  
Old April 21st, 2016, 12:56
fyrfytr1717 fyrfytr1717 is offline
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Re: Radiator Fan Override Switch (The Easy Way)

The stray 12V+ is likely coming from the factory relay. When the ignition is on, 12V+ is being fed to one side of the factory relay's coil. It is just waiting for the other side of the coil to be grounded in order to activate.

My question would be why does the same ground that is completing the indicator light circuit not also cause the factory relay to activate? Hard to know what exactly the wiring inside the switch looks like so far as circuit isolation and/or multiple contacts goes.

Regardless, 12V+ coming to the bulb from both sides won't do anything as the circuit has no potential. When you flip the switch, pin 3 providing 12V- in place of that stray 12V+ should cause the light to turn on.
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  #227  
Old April 21st, 2016, 18:28
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hubs97xj hubs97xj is offline
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Re: Radiator Fan Override Switch (The Easy Way)

I have deleted the images from pbucket, so hopefully it won't get dug up much more. We're obviously years from being able to edit the posts, so sorry if it's still raining on your parade. My intention was to correct the bad info I was finding, and offer an alternative method to skin the same cat as easily. Cheers.

Last edited by hubs97xj; April 21st, 2016 at 18:32.
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  #228  
Old April 23rd, 2016, 23:11
fyrfytr1717 fyrfytr1717 is offline
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Re: Radiator Fan Override Switch (The Easy Way)

No worries hubs, your posts have been more than helpful over the many years you've been part of . It was a perfectly acceptable wiring diagram that you posted, it's just that in this particular thread, it was confusing folks who were just skimming through and not viewing it in context. Tons of threads on here discussing the approach you drew up of which I'm hoping your now deleted picture wasn't an integral part of.
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  #229  
Old August 7th, 2016, 20:51
craigbhikin craigbhikin is offline
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Re: Radiator Fan Override Switch (The Easy Way)

Thanks, you idea sounds better than my idea of just splicing a switch in with power and fuse. I will need to re read it again to be sure of what I am doing.
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  #230  
Old December 3rd, 2016, 15:38
rixdafix rixdafix is offline
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Re: Radiator Fan Override Switch (The Easy Way)

Great 6 year old write that's still helping people and inspired my first post. Did my 01 today. This mod works like a charm. I actually accessed most of the wires from inside the underneath of the distribution center. All solder and heat-shrink. Even used a switch with an LED indicator by disassembling the switch, reversing the diode leads and connecting the switches outer terminals reversed. Works like a charm. Thanks again.
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  #231  
Old December 4th, 2016, 10:31
fyrfytr1717 fyrfytr1717 is offline
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Re: Radiator Fan Override Switch (The Easy Way)

Glad you found it helpful rixdafix, and strong work with re-rengineering your LED switch to work!
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  #232  
Old January 27th, 2017, 08:07
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Coach Bruce Coach Bruce is offline
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Re: Radiator Fan Override Switch (The Easy Way)

Quote:
Originally Posted by rixdafix View Post
Great 6 year old write that's still helping people and inspired my first post. Did my 01 today. This mod works like a charm. I actually accessed most of the wires from inside the underneath of the distribution center. All solder and heat-shrink. Even used a switch with an LED indicator by disassembling the switch, reversing the diode leads and connecting the switches outer terminals reversed. Works like a charm. Thanks again.
I'm doing this mod today and couldn't figure out a way to get the led switch to light properly and send a neg. signal so I was going to use a second relay to switch the signal polarity under the hood. Can you explain how you modified the switch? I'm using a Carline switch from OTRATTW.
It has an independent LED for the text and a dependent LED for the symbol when activated. Any help would be appreciated.
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  #233  
Old August 22nd, 2017, 07:09
3blackbirds 3blackbirds is offline
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Re: Radiator Fan Override Switch (The Easy Way)

I'm going to resurrect this thread, hopefully. I have a '99 with the aux fan switch wired to the battery because I got a CEL. Switch works great, but getting heat soak. Photobucket has updated their policies so I can't see the diagrams anymore on how to add in the ELK-960 timer. Can anyone provide the diagrams for the ELK-960? -Thanks
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  #234  
Old March 29th, 2018, 14:30
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Re: Radiator Fan Override Switch (The Easy Way)

now that editing is allowed, any chance we could get the photos back?

This is on my to do list, as my XJ heat soaks pretty bad when wheeling. Leaving the aux fan running when I do a short trail shut-off would help.
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  #235  
Old March 31st, 2018, 19:38
josh9mile josh9mile is offline
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Re: Radiator Fan Override Switch (The Easy Way)

I did this to both my jeeps by splicing a wire into the dark blue/pink wire with just a switch to ground. No CEL yet and it was super easy!
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  #236  
Old March 31st, 2018, 20:18
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Re: Radiator Fan Override Switch (The Easy Way)

Quote:
Originally Posted by josh9mile View Post
I did this to both my jeeps by splicing a wire into the dark blue/pink wire with just a switch to ground. No CEL yet and it was super easy!
What year?
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  #237  
Old March 31st, 2018, 20:19
josh9mile josh9mile is offline
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Re: Radiator Fan Override Switch (The Easy Way)

93 and 96
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  #238  
Old April 1st, 2018, 10:18
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lazyxj lazyxj is offline
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Re: Radiator Fan Override Switch (The Easy Way)

Quote:
Originally Posted by IslanderOffRoad View Post
This is on my to do list, as my XJ heat soaks pretty bad when wheeling. Leaving the aux fan running when I do a short trail shut-off would help.
My 01 had always had this problem when wheeling in warm conditions, even after a long list of mods designed to prevent it.
The best cure so far has been adding a 3 minute timer to the aux fan so it continues to run after the engine is shut down. Pushing a button on the console starts the timer.
Works every time and is well tested with nine years of use.

https://www.flickr.com/photos/lwade/...th/3482846101/
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  #239  
Old April 5th, 2018, 08:11
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Re: Radiator Fan Override Switch (The Easy Way)

Quote:
Originally Posted by josh9mile View Post
93 and 96
Both of those are before the OBD-2 failure detection system really grew teeth (and the 93 is before OBD-2 even existed.) So that's not surprising. This writeup is really intended for 97-01 guys whose ECUs will freak out if they see a solenoid/relay drive circuit stuck high or low when it shouldn't be.

Kinda surprised you got away with it on the 96, but not overly. 96 OBD-2 failure detection was extremely minimal compared with even 97s, and they really added a lot for 98.
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  #240  
Old April 6th, 2018, 22:50
josh9mile josh9mile is offline
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Re: Radiator Fan Override Switch (The Easy Way)

Quote:
Originally Posted by kastein View Post
Both of those are before the OBD-2 failure detection system really grew teeth (and the 93 is before OBD-2 even existed.) So that's not surprising. This writeup is really intended for 97-01 guys whose ECUs will freak out if they see a solenoid/relay drive circuit stuck high or low when it shouldn't be.

Kinda surprised you got away with it on the 96, but not overly. 96 OBD-2 failure detection was extremely minimal compared with even 97s, and they really added a lot for 98.
Actually just tonight I got a CEL for fan relay. Thought I was gonna be lucky.
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