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Modified Tech Discussion Forum for Tech related discussion for Modified XJ's and MJ's. |
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#211
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Re: Radiator Fan Override Switch (The Easy Way)
Based on what I've read, I thought the electric fan in an XJ is based around the ground wire not being connected until its passed through by the thermostat control. Couldn't you just splice in to that wire right at the fan, and then run a toggle to a switch which is grounded? On = grounded and the fan runs, off = still running under normal control from the truck.
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#212
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Re: Radiator Fan Override Switch (The Easy Way)
No, splicing at the fan would do no good. The ground that's not connected is at the relay in the PDU. Connecting to the ground wire for the relay with a toggle to ground will allow the functioning as you said. Newer 97+ jeep don't like it however and may throw a CEL light, the older ones don't care.
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#213
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Re: Radiator Fan Override Switch (The Easy Way)
Has anyone done this a high amp toggle switch to apply power directly to the blue wire going to the fan on a 00-01 to see if does a CEL? I bought a relay and the darn thing isn't labeled so I have zero clue which one is 87, 87a, 30, etc. But that got me thinking why not just run a toggle to simplify the whole thing?
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#214
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Re: Radiator Fan Override Switch (The Easy Way)
If I'm reading it right, yes, a few people have. It causes the check engine light to come on.
I just went to the junkyard and grabbed a fog light relay out of another XJ to use for this. It's labeled, was $.50 and is more than up to the task of activating the real fan relay. |
#215
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Re: Radiator Fan Override Switch (The Easy Way)
I just used the write-up on the first page on my 2000. It was easy and works great. Thanks for the write up!!!
I took me about half an hour to do the whole thing. |
#216
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Re: Radiator Fan Override Switch (The Easy Way)
Glad to see people are still finding this thread useful, 6 years later! The override is still working as intended on my XJ...
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#217
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Radiator Fan Override Switch (The Easy Way)
Today I was diagnosing my 2nd e-fan not working and it turned out to be the fuse instead of the relays. Switch still works and no cels. I rec this thread on occasion. Thanks again.
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#218
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Re: Radiator Fan Override Switch (The Easy Way)
I have a wiring question.
Since I am feeding the new fan relay a GROUND signal from the in-cab switch, I don't have a 12v source going to the switch (standard five pin rocker switch). I'd like to wire the switch up so it illuminates when I turn on the headlights like other switches. My problem is that the pin where I usually feed the switch a 12v signal is currently used to feed the ground signal. How do I get the switch to light up? |
#219
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Re: Radiator Fan Override Switch (The Easy Way)
Quote:
This is how you'd wire your aux. fan, it uses a SPST switch. I've a SPST switch that has three terminals to power the circuit. It's a Daystar KU80011. No.7 is the ground for the lamp, No.3 is power out, and 2 is power in. Using a switch like this the lamp lights when the fan is turned on. Having a switch light when using the cars lights you would have to have the switch spliced into the headlamp switch directly. Not sure how to wire with your particular 5 terminal switch. |
#220
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Re: Radiator Fan Override Switch (The Easy Way)
I really wish the above referenced wiring diagram had never been posted in this thread, it really did clutter it up and causes confusion as it is in conflict with the idea/intent of this thread.
That being said, you can still make your switch light up with the rest of your instrument panel so long as your switch provides for that option. It works fine with my Carling switch. The main light illuminates when the fan turns on/off, and the secondary light turns on/dims with the rest of my instrument panel. Can you provide a pin out diagram of your switch? One issue you may have however is dependent on the type of bulbs in the switch. Incandescent bulbs don't care if the + and - are switched so you can just ground the positive pin and apply the dimmer signal to the negative pin. If you have LEDs in the switch on the other hand, you may be out of luck as LEDs don't let current flow through backwards. Last edited by fyrfytr1717; April 15th, 2016 at 15:19. |
#221
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Re: Radiator Fan Override Switch (The Easy Way)
Here is the switch I'm using.
I have #6 hooked to the dash lights and #7 grounded. This works great for the lower light on the switch. It comes on with the dash lights and dims nicely. No problems there. I am feeding a ground signal to #2 and #3 goes to the fan relay I installed. The switch works the fan exactly as it should with no problems. If I ground #8, then the top (larger) light on the switch is on all the time and GOES OUT when I turn the switch on. It's like the fan relay is back feeding a 12v signal to the switch when the the switch is in the off position. Any thoughts? I'd like the top light to come on with the fan and go off with the fan. ![]() Last edited by MrSimon; April 18th, 2016 at 12:17. |
#222
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Re: Radiator Fan Override Switch (The Easy Way)
Try connecting #2 to your relay and #3 to the fuse.
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#223
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Re: Radiator Fan Override Switch (The Easy Way)
mechbull... please stop. Guessing at electrical and offering it up as advice only causes confusion and quite possibly damage/fire.
MrSimon, connect the dots... According to your diagram, there are two individual circuits in your switch. The circles with the "X" in the middle are your bulbs and need (+) on one side and (-) on the other in order for those electrons to flow through your bulbs. 1. The dash light circuit begins with (-) on pin 7, passes through the bulb, and ends with (+) on pin 6. You currently have that wired according to the diagram. 2. The indicator light circuit in our application is reversed. We need to apply (-) to pin 2 so that pin 3 receives a ground signal when the switch is activated. Since pin 2 is (-) and passes this (-) on to pin 3 when the switch is activated, pin 8 needs to be (+) in order to complete the circuit. Two possible issues. First, as I mentioned previously, if the switch uses an LED for the indicator this will not work as current only flows through them one direction. Second, if (despite what the drawing shows) pin 7 & 8 are actually a common (shared) ground for both lights, this will not work as desired. Do a continuity test between pin 7 & 8 to find out. |
#224
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Re: Radiator Fan Override Switch (The Easy Way)
Yes, don't guess when doing electrical work. Should Mr. Simon switch #2 and #3 on the switch, a fuse could be blown, or circuit breaker tripped. If it did happen to ruin the switch he'd be able to start over. Buy a new switch, one that doesn't offer up a confusing wiring scheme.
![]() Last edited by mechbullxj; April 19th, 2016 at 07:52. |
#225
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Re: Radiator Fan Override Switch (The Easy Way)
Quote:
If it is normal, and I feed a + signal to the #8 pin, won't I have two + signals coming in from different sides of the same circuit? |
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