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24-03-2012
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MudSplasher
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Join Date: Oct 2009
Location: Peakhurst, NSW
Age: 41
Posts: 1,899 What Jeep do I drive?: XJ
Likes: 419
Liked 275 Times in 139 Posts
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Thanks JJ - I used Omnigraffle on the Mac, which i use for network diagrams. If you're on Windows I could send you a PDF you could edit in Illustrator, you can get a 30 day trial from the Adobe website.
I'll go through you're recommendations later today.
__________________
98 XJ Sport 4.0L / Intake & Exhaust / Taurus Fan / 3" OME Lift / 31x10.5 Silverstone / HID & LEDs
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24-03-2012
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MudSplasher
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Join Date: Oct 2009
Location: Peakhurst, NSW
Age: 41
Posts: 1,899 What Jeep do I drive?: XJ
Likes: 419
Liked 275 Times in 139 Posts
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Quote:
Originally Posted by junglejuice
You don't need relays for that as you can just have a main relay that turns power to them on which if you insert your switch in series with it will turn them off.
You're right I haven't gotten around to fitting mine yet but that is how I will do it.
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From what I could read of the diagram that Billnick did, if I was to simply place a switch on the ignition feed to the first relay to kill the low speed (always on with ignition) circuit, the second fan would still come on with any high speed triggers. So that will save some relays but require two switches, no?
__________________
98 XJ Sport 4.0L / Intake & Exhaust / Taurus Fan / 3" OME Lift / 31x10.5 Silverstone / HID & LEDs
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24-03-2012
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MudSplasher
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Join Date: Oct 2009
Location: Peakhurst, NSW
Age: 41
Posts: 1,899 What Jeep do I drive?: XJ
Likes: 419
Liked 275 Times in 139 Posts
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Quote:
Originally Posted by junglejuice
Just for clarity purposes I also need to mention that the trans temp LED won't work in that configuration as the current draw from the relay coils will be too much for the LED to handle in series and if you were to ground it so it works as an indicator (as per normal) then it will also come on whenever the fans are on high speed so a diode is required after the LED to prevent that.
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Hmm wasn't expecting the coils would draw more power than the LED could take. Looking now, the LEDs I'm looking at state 30mA continuous, 75mA peak.
I still have some diodes here so shouldn't be a problem to do that, will just need to add it into the diagram.
__________________
98 XJ Sport 4.0L / Intake & Exhaust / Taurus Fan / 3" OME Lift / 31x10.5 Silverstone / HID & LEDs
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24-03-2012
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MudSplasher
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Join Date: Oct 2009
Location: Peakhurst, NSW
Age: 41
Posts: 1,899 What Jeep do I drive?: XJ
Likes: 419
Liked 275 Times in 139 Posts
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Quote:
Originally Posted by darksidecustoms
From what I could read of the diagram that Billnick did, if I was to simply place a switch on the ignition feed to the first relay to kill the low speed (always on with ignition) circuit, the second fan would still come on with any high speed triggers. So that will save some relays but require two switches, no?
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Just re-reading your post, we're you suggesting one master relay from the battery to all fans? And that triggered by a switch in-dash? I'd assume that would require a relay much bigger than 40A based on the draw of most of these fans nowadays, like the one recommended for the Taurus fan? I wanted to keep replacement parts easy to find and inexpensive...
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98 XJ Sport 4.0L / Intake & Exhaust / Taurus Fan / 3" OME Lift / 31x10.5 Silverstone / HID & LEDs
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24-03-2012
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RubiconSlammer
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Join Date: May 2011
Location: Ipswich, Brisbane.
Posts: 1,250 What Jeep do I drive?: ZJ
Likes: 115
Liked 281 Times in 182 Posts
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I think you could ditch the relay triggered by the OEM ecu fan. The wiring is designed to run a fan, it can surely run a couple of relays. The fact that it provides a ground is no problem. On the post updates the wiring diagram shows a +ve feed coming off a relay in the PCM, I presume the pre dates the ground also comes off a relay??
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24-03-2012
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MudSplasher
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Join Date: Oct 2009
Location: Peakhurst, NSW
Age: 41
Posts: 1,899 What Jeep do I drive?: XJ
Likes: 419
Liked 275 Times in 139 Posts
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Quote:
Originally Posted by Billnick
I think you could ditch the relay triggered by the OEM ecu fan. The wiring is designed to run a fan, it can surely run a couple of relays. The fact that it provides a ground is no problem. On the post updates the wiring diagram shows a +ve feed coming off a relay in the PCM, I presume the pre dates the ground also comes off a relay??
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That first relay is the factory fan relay and apparently can throw a code if using the oem 'trigger' circuit on OBD2 jeeps for additional things. Im assuming that the ECU expects a certain current or assumes a problem? Curious about the PCM relay though.
Correct me if I'm wrong or misinterpreted your post...
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98 XJ Sport 4.0L / Intake & Exhaust / Taurus Fan / 3" OME Lift / 31x10.5 Silverstone / HID & LEDs
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24-03-2012
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MonsterMoose
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Join Date: Nov 2003
Location: Brisbane, Southside
Age: 51
Posts: 10,539 What Jeep do I drive?: WK2
Likes: 369
Liked 1,110 Times in 691 Posts
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This is how you run 2 fans off 3 relays....
The rest is not required....
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JJ
Do it once, Do it right!
2014 WK2 Overland
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