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Where does this wire go?
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post #1 of 26 (permalink) Old 01-18-2010, 06:51 AM Thread Starter
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Electric Fan

My electric fan will not turn off - had to disconnect the battery. Can any one help with what could be wrong
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post #2 of 26 (permalink) Old 01-18-2010, 08:46 AM
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Heat sensor/switch I would say. There's a procedure for how to test it here on the forum and in the service manual.

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post #3 of 26 (permalink) Old 01-18-2010, 09:22 AM
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I would say it's either the temperature sensor, or the relay in the junction box. At least it's not the $400 fan motor, since it still runs. Jerry.

I am a motorcyclist, NOT a biker.


1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
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post #4 of 26 (permalink) Old 01-18-2010, 10:26 AM
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Quote:
Originally Posted by Revelation View Post
My electric fan will not turn off - had to disconnect the battery. Can any one help with what could be wrong
You do know that some times the fan will run for a few seconds after shut down. Any longer than that there is a problem.

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post #5 of 26 (permalink) Old 01-18-2010, 11:31 AM
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Quote:
Originally Posted by VN750Rider/Jerry View Post
I would say it's either the temperature sensor, or the relay in the junction box. At least it's not the $400 fan motor, since it still runs. Jerry.
400 dollar fan motor it looks like a standard 12 v elec fan to me ..been known to be wrong but i bet u could get one pretty cheap


you could also wire an inline toggle switch to shut it off when ya stop ridin .... just remember to flip it on befor u get stuck in trafficc and u should be good to go



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Last edited by seebeeare; 01-18-2010 at 11:35 AM.
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post #6 of 26 (permalink) Old 01-18-2010, 11:47 AM
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The first thing I would do is tap the heat sensor switch a few times with a screwdriver handle, or the like. The switch is down on the lower left side of the radiator, with a wire connector attached. Then tap the junction box, where the fuses are, with the screwdriver. Apparently there is a relay inside the JB that can stick, and may just need to be jarred a few times to unstick the contacts.

This is from the verses:
Radiator/Cooling Fan not shutting off

--------------------------------------------------------------------------------

Quote:
Q: Has anyone else come across the radiator fan NOT shutting off? On Tuesday I went out in the morning to ride and my battery was wasted.
What I noticed though was the radiator fan was still running. Usually
it runs after I shut the bike off but will usually stop running after
a few seconds. The problem now is it won't stop running so I had to
unplug its power source. I am now plugging it in when I go out to
ride but disconnecting it when I get to where I'm going.

Anyone got any idea what that might be or anyone come across this
issue? Bad thermostat?

By the way, the bike is not overheating and no overflowing of any
fluids; all coolant levels are ok.


A: I just had the same problem on my 95 750 i took mine to toe kawasaki shop the checked it out a the circuit box was bad. they fixed it it works fine now. Bill

A: Hey, had this very same problem... first problem I had with my VN750. On mine, it was a fan control relay sticking. sometimes in an old relay, or one that hasn't come on in a long time, when it DOES turn on after so long... it sticks in the "on" position. next time it does it, or if it does it next time you start it up, take the seat off and look on back of the battery box for the junction box. I give it a whack with my leatherman, and voila, the relay tripped back the other way. I had to do that a few times... now and then for a week or two, after I bought my bike, then it quit doing it.
After the relay had tripped back and for several times it probably cleaned itself off. note: The bike had been stored for the winter just previous to me buying it, hence the long time without the relay being tripped. Other times the contacts inside the relay just plain arc for whatever reason, andthe same rules apply... whack it now and then and it might straighten up, or if it doesn't you at least know how to shut it off til you can get a new junction box installed. Scott 1992 VN750 Sylvia


Quote:
Q: I have had a suspicion that my radiator cooling fan has not been coming on of late. Usually, I shut off my bike after a ride, and then back it into its parking space in front of my truck in the garage, but to test my suspicion, I left it running, knowing that normally the fan would come on before I got it parked. Sure enough, no fan.... so, I got out a screw driver and lightly tapped the housing around the fan a couple times... viola... the fan came on. Was it just stuck in a particular place in its rotation? Did I jiggle the sensor enough to make it work... this time? Is my problem solved? I guess I won't know that until my next ride, but any suggestions from anybody, or comparing notes from others who have experienced the same thing would be appreciated. Thanks, Jangles

A: I had this happen before.. Turned out it was a crudded up connector. We pulled it apart, cleaned it up and repacked with dielectric grease and it has been running fine every since. The connectors especially in the front of the bike seem to pick up a lot of road grime even if they are tucked back. Ended up being a cheaper fix then replacing the fan and sensors *S* There is a way to check the fan by jumping it but not sure of the exacts.. hopefully someone else will fill in that part.

A: you say the fan housing, I would dare suspect the motor itself having a bad brush, or a stuck one. tapping it may have jarred it loose. having same trouble with wife's starter motor, cleaned the brush holders and hoping for the best. would get another starter, but they are quite hard to come by used and cheap, so far still looking. not sure how hard it is to get fan motor apart....other idea is did you jiggle the sensor wire a little and it was just a dirty contact? also check the connector the fan operates by also. testing the fan: can be tested for brush problems by removing it and connecting it to a low voltage source, like 6 volts. momentarily run motor to make sure it will not be dangerous to hold the blades (not running too strong) grab blades firmly, or use a pencil or something to hold them with. apply low voltage, walk blades around...if it finds a spot where it isn't pulling your hand, you have a bad motor. don't keep motor in same place over a second or two, or it may over-heat. Thanks, just my 2 cents....... Beavis

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Purchased May 16, 2008
Approx.19,300km (12,000 miles)

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July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15


TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/11-vn750-general-discussion/9127-top-ten-items-you-would-suggest-new-owner-do-his-new-ride.html

Last edited by OlHossCanada; 01-18-2010 at 07:32 PM. Reason: improve clarity
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post #7 of 26 (permalink) Old 01-18-2010, 06:53 PM Thread Starter
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Thanks to all who replied. How do you disconnect the fan. Is there a switch or connection that can be disconnected so the fan is shut down
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post #8 of 26 (permalink) Old 01-18-2010, 07:22 PM
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Yes, just pull the wire off the heat sensor switch down on the rad.

Gordon

1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
Relocated R/R
MF-AGM battery
Fiamm Freeway Blaster horns
F&S luggage rack and engine guard
Kury Offset Hiway pegs
July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15


TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/showthread.php?t=9127
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post #9 of 26 (permalink) Old 01-18-2010, 10:40 PM
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You can also pull the wires off the fan motor itself.
I was wrong about the price of the fan. 59502 fan assembly-$460.57. Talk about a rip off. I believe this is the same fan that the first generation KLR650 used, and back when I had one of those, and belonged to a KLR650 forum, someone had figured out a much cheaper way of replacing it. You can't just use any 12V fan, the factory fan spins at about 50,000 RPM, way faster than any ordinary fan would. Jerry.

I am a motorcyclist, NOT a biker.


1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
2002 Vulcan 750 parts bike
1994 Yamaha XT225 parts bike

Last edited by VN750Rider/Jerry; 01-18-2010 at 10:59 PM.
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post #10 of 26 (permalink) Old 01-18-2010, 11:48 PM
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HERE is a radiator and fan on eBay
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