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Discussion Starter · #1 ·
Hi, has anyone wired a fan to a switch on a 2006 350? I can get it to work but the oil temp lights stays on all the time the fan's on. Is there any way to do this without disconnecting the thermosensor?
 

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You should just be able to splice into the ground wire going into the fan with another wire and just ground the other end to the engine or frame. You can put a toggle switch on this wire if you want.
 

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Discussion Starter · #3 ·
Have done that but the oil temp light stays on constantly when you flick the switch on. Is there any other way? I'd like to leave the sensor connected if I can. There's nothing wrong with my sensor, but I'd like the fan to come on sooner. When towing or yard work.
 

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Have done that but the oil temp light stays on constantly when you flick the switch on. Is there any other way? I'd like to leave the sensor connected if I can. There's nothing wrong with my sensor, but I'd like the fan to come on sooner. When towing or yard work.
When you spliced into the wire, did you splice into it near the sensor or where if plugs into the fan?
 

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You need a SPDT switch, the common goes to the fan, one leg of the switch goes to ground, the other leg to the original connection from the wiring harness. In other words, you want to OR the connection, either this OR that.

ADDED: Look at the SPDT switch on this page. Common to the fan, A to ground, B to the original connection.

http://www.kpsec.freeuk.com/components/switch.htm
 

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If you splice into the ground wire where it plugs into the fan and ground it, it shouldn't make the oil temp light come on, but if you splice into the wire near the sensor before it goes through the control unit, it will make the light come on.
 

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You need a SPDT switch, the common goes to the fan, one leg of the switch goes to ground, the other leg to the original connection from the wiring harness. In other words, you want to OR the connection, either this OR that.
Yeah, I believe that is what he wants and that should work.
 

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Without looking at the actual schematic of the control unit [internal guts of the unit] I would avoid grounding anything without using the switch as I posted above. It will probably not hurt it, but I wouldn't say that with certainty without actually seeing the circuit schematic with my own eyes.

Using the swtich like I describe I am certain won't hurt anything. ;)
 

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Without looking at the actual schematic of the control unit [internal guts of the unit] I would avoid grounding anything without using the switch as I posted above. It will probably not hurt it, but I wouldn't say that with certainty without actually seeing the circuit schematic with my own eyes.

Using the swtich like I describe I am certain won't hurt anything. ;)
I've seen people splice into the ground wire where it plugs into the fan, with another wire and ground it so the fan would run all the time and it didn't hurt anything.

The way you're suggesting would definitely be the best way, though.
 

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Yeah, it's probably fine. I'm just being anal and wouldn't do it myself without seeing the schematic, but you have to use a switch anyway, so just use a SPDT switch instead of a SPST and it's 100% sure to never do any harm. It's just a little more work, but very little.
 

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Yeah, it's probably fine. I'm just being anal and wouldn't do it myself without seeing the schematic, but you have to use a switch anyway, so just use a SPDT switch instead of a SPST and it's 100% sure to never do any harm. It's just a little more work, but very little.
Yeah, I agree that would definitely be the best way and I would do it that way if I were going to do that.
 

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on a side note..why would you want the fan to come on sooner anyway ?..when honda designed these..i'm sure they made it so the fan would come on at a safe oil temp anyway ?..now..if it's just a '' thing '' that you want to hear the fan on when you want..well..that's your choice..me myself..i don't worry about something..until it's broken !..lol..here's a thought..have you checked into finding out if honda or even a after market place makes and sells a lower temp sensor ?..sounds like that would be easier to do..than mess up alot of wiring. now..if your fan isn't comming on at all..then thats a fan relay control unit thats bad.
 

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Discussion Starter · #13 ·
Everything working ok. I do a lot of yard work, towing trailer 100 meters stopping unloading towing back again. The temp is high all the time. Rearly get a good flow of air through the cooler. Would like to have cool air running through the cooler a little more. It can only be good for the oil & engine keeping it cooler.
 

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Everything working ok. I do a lot of yard work, towing trailer 100 meters stopping unloading towing back again. The temp is high all the time. Rearly get a good flow of air through the cooler. Would like to have cool air running through the cooler a little more. It can only be good for the oil & engine keeping it cooler.
sounds fair enough..keep in mind though..if you bypass the oil temp sensor..and your oil gets hot for some reason..and your oil temp light never comes on..well..boom !..you just blew your motor..this is always a chance when you go messing with factory wiring..just a thought you may want to think about...now...this is if you some how forget to turn that fan switch on !..lol.
 

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Everything working ok. I do a lot of yard work, towing trailer 100 meters stopping unloading towing back again. The temp is high all the time. Rearly get a good flow of air through the cooler. Would like to have cool air running through the cooler a little more. It can only be good for the oil & engine keeping it cooler.
sounds fair enough..keep in mind though..if you bypass the oil temp sensor..and your oil gets hot for some reason..and your oil temp light never comes on..well..boom !..you just blew your motor..this is always a chance when you go messing with factory wiring..just a thought you may want to think about...now...this is if you some how forget to turn that fan switch on !..lol.
If he hooks it up like Pain suggested, with a SPDT switch, it will either be on all the time or it will be like it's supposed to be. One side of the switch will be wired so the fan will run all the time and if he flips the switch the other way, it will complete the circuit that is already there and it will work like it's meant to work.
 

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Discussion Starter · #16 ·
Thanks for all the ideas esspeciality Helmut & Pain. Gonna try that switch. Sounds like it will work. I'll let you all know how I get on. Thanks again.
 

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My 03 rancher, the fan wont even come on.... i checked the fuse and it aint blown so i dont know what to do
Unhook the wire from the oil temp sensor and ground it to the engine and see if the fan comes on. Don't forget to turn the key on when you try this.
 

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and if it doesnt come on, my fan motor is bad?
Check all your fuses first, one of the fuses is for the fan motor.

If it's not a fuse, either the fan motor or the control unit is bad.

To test the fan motor, use a 12V test light to make sure you are getting power to the fan. I don't remember the color of the power wire going to the fan motor, but I believe the ground wire is green, so it will be the wire that isn't green. If you have power on the other wire, the one that isn't green, then splice into your green wire and ground it to the engine or frame and the fan should come on. If it doesn't, the fan motor is bad. Make sure you have the key on.
 
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