Disconnect fan switch, fan still runs...??? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 4 (permalink) Old 09-26-2011, 11:20 AM Thread Starter
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Disconnect fan switch, fan still runs...???

In my previous posts, I have described how sometimes when turning my bike off, the fan will be running and will not shut off. Not all the time, maybe once out of every 6 or 7 times. So, I tried following a suggestion I got on here, and pulling the connector off the fan switch while it is running to see if it stopped. It didn't - kept on running even with the wire disconnected from the switch.

Because I am not very electrically inclined, I am at a bit of a loss to think of what could cause it to keep running with the switch disconnected. Someone mentioned maybe a wire contacting against the frame, or a sticky relay. Anyone have any ideas of how I might test one of those suppositions?

Any and all advice as always is greatly appreciated


AZ Kev

Arizona Kev

1989 VN750
7800 orig mi when purchased Jan 2011
Turned 11,000 mi Nov 2011
Saddlebags
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Chad's highway peg mounts
Emgo Pegs
Aftermarket mirrors
Dunlop D404's

Otherwise, all stock


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post #2 of 4 (permalink) Old 09-26-2011, 10:33 PM
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The wire you pulled off was on the thermoswitch on the lower left side of the radiator??

There is another sensor wire for the temp gauge up by the pressure cap or thermostat, under the tank.

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
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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 #3 of 4 (permalink) Old 09-27-2011, 12:21 AM
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There are two electrical connections on the lower left side of the radiator. One is a two pin harness, the other a single slide on connection. The two pin harness supplies power, and if you disconnect that the thing will shut off. The single lead, when grounded, will trigger the relay and kick the fan on. Bad insulation along that wire could be causing the relay to stay closed (supplying juice), while vibration could explain the intermittency (getting bounced around to a grounded position sometimes).

To test that, you could wire a new lead from the single spade on the radiator (along the lower frame for temporary convenience) back to the junction box and see if the fan still gets stuck on (you will need a new lead to fit in the junction box harness for your temporary. Be careful no to do any damage to the plastic when removing the current lead) If the fan still runs with the new wire, the relay is sticky. Sometimes whacking it will free it up, but if its a recurring/non-constant problem, the relay may be on its way out. That requires replacing the junction box, unless you find a way to get into it. They aren't made to be serviceable

FWIW, dripping acid from the battery will wreck the relays... that's how they short out, turn the fan on, and drain a battery. Make sure you have a proper vent tube, especially if you end up with a new junction box.

If it ain't broke... well I'm sure I can find something that is
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post #4 of 4 (permalink) Old 09-27-2011, 01:53 AM Thread Starter
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Gordon - yes, I believe that is the one I pulled off. It is a single slide on lead as Bazooka mentioned.

And thank you for the tips BL. From the sounds of it, I am thinking the relay may be sticking. And now that I know how to test that, I will probably give it a shot the next time I get a chance. Fortunately, someone else pointed out how to unplug the 2 pin connected to kill the power to it completely, so I have been able to do that whenever it sticks to avoid the draining of the battery.

I guess I may want to start looking for a junction box sometime in the near future. Thanks all : )

AZ Kev

Arizona Kev

1989 VN750
7800 orig mi when purchased Jan 2011
Turned 11,000 mi Nov 2011
Saddlebags
Taillight relocation kit
Chad's highway peg mounts
Emgo Pegs
Aftermarket mirrors
Dunlop D404's

Otherwise, all stock


"But it's a dry heat - like the inside of an oven"
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