Darkside Customs' Dual (or Triple) Electric Fan Conversion - Page 2 - AUSJEEPOFFROAD.COM Jeep News Australia and New Zealand

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Old 24-03-2012
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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.
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Old 24-03-2012
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Originally Posted by junglejuice View Post
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.
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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Old 24-03-2012
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Originally Posted by junglejuice View Post
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.
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.
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Old 24-03-2012
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Quote:
Originally Posted by darksidecustoms View Post
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?
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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Old 24-03-2012
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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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Old 24-03-2012
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Quote:
Originally Posted by Billnick View Post
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??
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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Old 24-03-2012
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This is how you run 2 fans off 3 relays....



The rest is not required....
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