Radiator Fan Spastic - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Electrical
Where does this wire go?
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post #1 of 14 (permalink) Old 04-21-2012, 06:38 PM Thread Starter
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Radiator Fan Spastic

So today there was a pretty good down pour. Right after it finished I went to leave and noticed the fan on my bike was running. I haven't ridden it in a few days, so it definitely wasn't warm. When I came home it was off, clicked on for about 3 seconds then clicked back off.

Are there any common electrical connectors that may be shorting out from the rain? I guess this might explain why my battery keeps randomly going dead. Any ideas of where to start would be awesome. I haven't spent much time looking in to it. Did a search and didn't see anything. Was just curious if anyone else has had this problem before I started my own exploration.

Thanks!

Also, when I ride the bike normally, once the temp. gauge rises high enough the fan clicks on and clicks off as normal once the temp. comes down. So it operates normally in that regard.

1993 Kawasaki Vulcan 750
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post #2 of 14 (permalink) Old 04-21-2012, 06:45 PM
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the temp sensor on the engine grounds the fan motor and turns it on. if it usually works correctly you may have a bare spot on that wire where it's hitting the frame. a wet bike would make it more likely to short and turn on the fan randomly. others will chime in if i'm wrong about it grounding but I'm pretty sure that's how it works. good luck.

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post #3 of 14 (permalink) Old 04-22-2012, 07:28 AM
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Do you have a schematic for the cooling system? When your having electrical issues a schematic is a must or your just guessing at what to check. Makes it so much easier you know exactly what wire does what and how the circuit works.
From what I see there is a fan relay inside the JB, it acts like a switch between the fan and the battery via the 30AMP (main)fuse. For that relay to operate it needs a 12VDC source and a ground. The relay gets it's 12 volts inside the JB and is present all the time, and gets it ground via the Fan switch (Temp Sensor). So the fan switch doesnt supply the ground to the fan it supplys the ground to the relay. The fan connector blk/yel wire is a ground and it should have a ground all the time. The blue wire is the 12VDC and goes to the JB. The blk/yel wire on the fan switch goes to the JB. Hopefully this helps out a bit.

Last edited by ifixf18s; 04-22-2012 at 07:36 AM.
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post #4 of 14 (permalink) Old 04-23-2012, 07:09 PM Thread Starter
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Thanks for the info guys. I have a schematic in the Clymer's. I just thought I'd see if anyone else had run in to a similar issue and if there was a common fail point. Guess not. Will do my own trouble shooting in a week or two and report back.

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post #5 of 14 (permalink) Old 04-25-2012, 08:34 PM
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My '05 does this occasionally, when i shut it off ,i dismissed it as a cool down feature,as it only does it after a long ride on a hot day.
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post #6 of 14 (permalink) Old 04-25-2012, 10:37 PM
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it is supposed to run for about 3 minutes max after shutdown for proper cool down
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post #7 of 14 (permalink) Old 05-05-2012, 08:50 PM Thread Starter
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Yes it runs when it is warm after I shut it off (normal operation). But on that day it ran when it hadn't even been ridden that day.

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post #8 of 14 (permalink) Old 05-05-2012, 09:18 PM
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has it done this since the rain storm?
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post #9 of 14 (permalink) Old 06-17-2013, 10:13 AM
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I know this is an old thread but I was curious if the OP found out the problem. I happened to have this same issue yesterday under similar conditions. I rode the bike Saturday and parked it in the early afternoon. Bike sat all night and all day Sunday without being ridden due to the weather not cooperating. Went out to the garage during a rainstorm and found my fan to be running with the ignition off and the run/stop switch in the stop position. Any help with this would be appreaciated.
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post #10 of 14 (permalink) Old 06-17-2013, 10:30 AM
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Didn't read back through the thread, but I would have to guess the temp switch is grounding internally, replace it. I assume moisture is getting inside and bridging the switch.
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