Wet bike, cooling fan stayed on till bty died - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 8 (permalink) Old 08-04-2010, 10:13 AM Thread Starter
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Wet bike, cooling fan stayed on till bty died

Has this happened to anyone else and can you suggest a place to look to address the problem?

the story: I was driving in the rain the other day (woopie) and when I got home the bike was fairly soaked. The fan was running when I shut off the bike but it does that sometimes so I didn't give it much thought. Later the next day, another rainy day, when I got home from work I noticed that the fan was STILL running and my battery was nearly dead. 3 words: wtf !

I intend to let the bike dry out and pull the battery to recharge it but that of course won't address the problem.

Any suggestions?

86 VN750
Completed mods:
Custom solo seat
side mirrors
Windsheild
Bars, grips and end caps
side-mounted tail light with plate bracket
Reshaping, shortening rear fender
Paint
V&H exhaust

Projected mods:
rear indicator lights
shifter arm

Lots of polishing!
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post #2 of 8 (permalink) Old 08-04-2010, 10:33 AM
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Don't ride in the rain...problem solved. Just kidding.

My 93' would do this when getting caught in the rain but would just die on the road. A short somewhere, mine was a shot wiring harness getting wet and grounding out. Sometimes using some spray silicone on the wiring can help shed water. When the bike is cool spray it on all connections and sealed electrical components and let it set. This may help but you still should investigate the problem by pulling the fan out and see if there are any exposed wires and follow it to the FB. You will have to remove the tank to check the wires under there.

Others may have more experience and will chime in soon.

01' VN750
Jardine cross over exaust
Kyriakin grips and foot pegs
Modified seat and backrest
Windshield
Luggage rack
Crash bar with Kyriakin pegs and extensions
Kumho 758 165/80-15 CT rear Dunlop 404 110/90-19 front
Coastered and air/fuel screws at 2.5 turns
Spline lube

93' VN750 getting TLC
Decals and mirrors
Coastered and air/fuel screws at 2.5 turns
ACCTs to MCCTs
Degoated with Harley mufflers
Duro 110-90-19 front 150-90-15 rear
Pick-up coils at .020
Spline lube
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post #3 of 8 (permalink) Old 08-04-2010, 01:04 PM
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The fan switch is on the bottom left of the radiator. Pull the connector off and see if the fan goes off. If it does more than likely the switch needs replacing.

02 honda sabre 1100
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post #4 of 8 (permalink) Old 08-04-2010, 06:47 PM
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X2 on the switch

2003
Name: "Bike"
*Battery connected at both ends!
*Real air in the tires
*New Registration sticker
*Seat wiped off
*Low AND Hi beam headlight!
*New #1157 tail light bulb
*Brake pedal still on the right
*Custom valve stem caps made from black plastic!
*Custom built ignition key from Kawasaki
Does anybody really care?

"When I die, I want to go peacefully like my Grandfather did, in his sleep -- not screaming, like the passengers in his car"
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post #5 of 8 (permalink) Old 08-04-2010, 09:43 PM
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Fan switch testing procedure is in the Clymer manual, and probably in online Kawi manual too.

Here is a link to a short write-up of the test.
https://www.vn750.com/forum/showthrea...test+procedure

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/11-vn750-general-discussion/9127-top-ten-items-you-would-suggest-new-owner-do-his-new-ride.html
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post #6 of 8 (permalink) Old 08-06-2010, 08:30 AM Thread Starter
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Well the bike dried out and the battery, freshly recharged, went back in last night. The fan DID NOT instantly come on so I guess it was a water-instigated short.

Thanks for the advice guys, I'll check out the wiring to the switch and spray it down.

86 VN750
Completed mods:
Custom solo seat
side mirrors
Windsheild
Bars, grips and end caps
side-mounted tail light with plate bracket
Reshaping, shortening rear fender
Paint
V&H exhaust

Projected mods:
rear indicator lights
shifter arm

Lots of polishing!
north115 is offline  
post #7 of 8 (permalink) Old 08-06-2010, 08:34 PM
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Quote:
Originally Posted by niterider View Post
The fan switch is on the bottom left of the radiator. Pull the connector off and see if the fan goes off. If it does more than likely the switch needs replacing.
this would work... unless there is a bad harness, or a bad JB... water in both of those places could also cause the fan to stay on.
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post #8 of 8 (permalink) Old 10-22-2010, 03:14 PM
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Quote:
Originally Posted by north115 View Post
Has this happened to anyone else and can you suggest a place to look to address the problem?

the story: I was driving in the rain the other day (woopie) and when I got home the bike was fairly soaked. The fan was running when I shut off the bike but it does that sometimes so I didn't give it much thought. Later the next day, another rainy day, when I got home from work I noticed that the fan was STILL running and my battery was nearly dead. 3 words: wtf !

I intend to let the bike dry out and pull the battery to recharge it but that of course won't address the problem.

Any suggestions?
Had the same issue with my fan staying on, except mine was self-inflicted... Decided it was freakin' awesome idea to break out my pressure washer on the bike. Didn't get it too close, but more like sprayed it off. When drying her the fan kept clicking, then finally came on. I was like WTF!!! I ended up disconnecting the fan plug and let it dry the rest of the night. Next morning, I connected it back up and, dangitt!!! the fan was running again. got to work and unplugged it. That afternoon when I got ready to go home I plugged it back in and the fan was off. Of course, then I started worrying that the fan was burned out... But, not to worry long. When I got home the fan was on...
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