Curious?
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Joined: Sep 2006
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From: Washington, DC
Seen it done of F3s, but I really don't recommend it. If you're running hot because of idling through traffic, that means that your charging system will be put under additional strain from running the fan excessively.
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Joined: Mar 2009
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From: Marietta, Ohio
Yea thats a very good point, you may not think you would forget but maybe you had a bad day and just sitting in traffic and you look down and your motor is 300*. Id say just leave it stock, when it gets hot it kicks on..
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/shrugs. You could do it, wouldn't have to even disconnect the power leads from the temp sensor thats triggering your fan, could just connect a secondary power wire to a switch. That way when the bike tries to turn the fan on it can, and if you want to turn it on you can. If you have it on and the bike tries to turn it on at the same time, no big deal, would just be the same exact voltage, just from two sources, no big deal. Only possible hitch would be if the stock supply from the bike might be sensitive for some reason to voltage backfeeding down that line, but you could diode the line to prevent it in that case. I doubt it would be sensitive though, a fan motor free spinning in the wind would act as a generator to some extent and it doesnt seem to care. The one good complaint about it would be the possibility of draining your battery some by running the fan excessively at idle when the stators not really spinning enough to supply that much voltage, so it would drain the battery some. Dunno how big a problem that would be but it would be easy enough to self monitor its use if you discovered it causing a charging issue from overuse.
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Joined: May 2009
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I think I'd just jump the sensor coming out of your radiator with the switch, no need to mess with hot wires that way.
That being said, I wouldn't do it because I don't see the advantage of you doing it over the switch doing it. I live in the middle of a lot of traffic and it is annoying after a few lights it's always on but hey, keeps the engine alive.
That being said, I wouldn't do it because I don't see the advantage of you doing it over the switch doing it. I live in the middle of a lot of traffic and it is annoying after a few lights it's always on but hey, keeps the engine alive.
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Joined: Mar 2008
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From:
my original fan blew, so i hooked up a 12 fan to it to a toggle and let me tell ya. it sucks. first u have to drill a hole somewhere for the toggle. then u got more wires running around. plus like someone else said u dont wanna forget to turn it on, the temps jump up quick esp when uve been riding. so now i just ride without a fan. i stay outta traffic which isnt hard to do since i live int he sticks, alotta 50-55mph country roads and keep an eye on it. if i start getting hot, i just pull over and have a butt. my advice tho, keep it stock. its a perfect design
I did it. I have it wired so when the toggle is off, it relies on the temperature relay to activate the fan (like normal). Turning the switch on just forces the fan on. I did it because I love riding at night, and up where I am it often gets down into the 40's. I throw the fan on to blow the heat back at myself and warm up a bit. Sounds hilarious, but man, its NICE when your legs are going numb. 
Sounds like you're doing it to DISABLE the fan at certain times. I wouldn't reccomend that AT ALL. You'd be amazed how fast these engins can overheat while idling. Be happy you at least have a liquid-cooled bike, and not one of those massive air-cooled engines on the cruisers. Those things make you feel like you're in the bowels of hell, just sitting at a traffic light.
Sounds like you're doing it to DISABLE the fan at certain times. I wouldn't reccomend that AT ALL. You'd be amazed how fast these engins can overheat while idling. Be happy you at least have a liquid-cooled bike, and not one of those massive air-cooled engines on the cruisers. Those things make you feel like you're in the bowels of hell, just sitting at a traffic light.
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Joined: Apr 2009
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From: NC
i wouldn't do it to disable the fan. i would want it how you have it, if i were to do it johnnyx. i was considering doing it because i know when my fan is going to come on meaning i know when i am going to have to sit at a lite for a long time, or ride at less than 35 for a long distance. i'd like to turn it on before it reaches that 212 mark.
212 is the optimal engine temprature, IIRC. The fan shouldn't be on before that, anyway.
But, to answer your question:
You just need some wire and a 3-pole, 2-position switch. Wire Position 1 as FUSE > SWITCH > TEMP. RELAY, and Position 2 as FUSE > SWITCH > FAN.
Pos 1 is normal, "stock" functionality, allowing the bike to regulate the fan on its own
Pos 2 forces the fan on, no matter what.
But, to answer your question:
You just need some wire and a 3-pole, 2-position switch. Wire Position 1 as FUSE > SWITCH > TEMP. RELAY, and Position 2 as FUSE > SWITCH > FAN.
Pos 1 is normal, "stock" functionality, allowing the bike to regulate the fan on its own
Pos 2 forces the fan on, no matter what.
Last edited by johnnyx; Jun 18, 2009 at 11:13 AM.
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