Help w/Fan Troubleshooting? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 9 (permalink) Old 07-19-2013, 05:52 PM Thread Starter
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Question Help w/Fan Troubleshooting?

My fan has quit working, it runs when hot wired, the relay clicks when I ground the temp switch wire but the fan doesn't run.

Bad junction box?

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post #2 of 9 (permalink) Old 07-19-2013, 06:46 PM
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most likely.....I replaced a few relays already so let me know if you need help.
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post #3 of 9 (permalink) Old 07-19-2013, 07:05 PM
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Spock based on your post, it has to be the relay or wiring from the relay to the 2 pin fan plug in. The BL wire has to be hot when the sensor is grounded.

Junction box work or external relay.
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post #4 of 9 (permalink) Old 07-19-2013, 07:20 PM Thread Starter
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Question

Isn't the fan relay soldered into the junction box?

When I go back out in a few, I'll double check for a ground on the fan wiring and check for voltage coming to the fan plug.

I read some old posts where they just wired in a new relay. Would probably be the simplest, most economic fix if the relay or junction box is the problem, right?

2003-21k mi
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__________________________________________________ ____________
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Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf
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post #5 of 9 (permalink) Old 07-19-2013, 09:02 PM
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Yes the relays are soldered into the PC board in the junction box, but with a hot knife and a soldering iron you can replace them

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post #6 of 9 (permalink) Old 07-20-2013, 01:37 AM Thread Starter
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Question

Battery at 12.96v, blue wire to the fan gets 10.4v when I ground the wire for the temp switch.

Ground for the fan is solid.

Possible causes for the voltage drop?

This motor can't run at all with 10.4v?
I'd think it could at least run slow, like the fan on a car heater, but electric motor wiring and design isn't my gig. Pretty obvious it won't, at least in this case. I do know there are differences.

Had to work on my truck late, temp dropped more than 20 in ten minutes as the storm front rolled through and made it pretty nice. Of course China packed the wrong part in the box, so that time was mostly wasted. May have to do another mountain bike ride to the parts store.

2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
Repair Manual: http://www.mediafire.com/file/mj7z81..._Catalogue.pdf

Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf

Last edited by Spockster; 07-20-2013 at 02:08 AM. Reason: Editing
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post #7 of 9 (permalink) Old 07-20-2013, 09:31 AM
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Fix it, Spock. A discussion of should it run a little or less, etc., would be pointless to me. I could not depend on it if it would run one more time, when tested. You are capable of fixing it.

A 12v DC motor will take over twice the current to start, than to run. Slow starting produces heat, increasing current demand. Not dependable.

Too early, not enough coffee, I talk too much.

I would fix it until the fan would pull the bike or I was happy.
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post #8 of 9 (permalink) Old 07-20-2013, 09:45 AM Thread Starter
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wm, obviously, I'm trying to fix it. But first, I'm gonna put it all back together, again, and try to make a run to the chinaparts stores and try to get the right part for my truck before traffic gets too heavy and I end up overheating Christine.

2003-21k mi
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post #9 of 9 (permalink) Old 07-20-2013, 09:11 PM Thread Starter
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Thumbs up Fan Failure Finally Fixed

The blue wire for the fan, on the 10-pin connector at the junction box, was loose on it's spade, really loose.

I gave the plug and the spades a shot of Power Lube ("Improves Electrical Properties"), unlocked the wire and pulled it from the plug, then pinched the edges so it fits tight now. Will be going through all those connections the same way when time allows.

Going to try harder to not get caught in the rain too. Several electrical gremlins have popped up since we were in the rain a week ago. The switch at the clutch lever is next, and I should get my gremlin bell out of the tool box and hung under the bike where it can do some good.

Took some rigging to make the chinapart work on the truck, but I'm still without those four wheels until possibly Monday. Toast for dinner again!

2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
Repair Manual: http://www.mediafire.com/file/mj7z81..._Catalogue.pdf

Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf
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