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Discussion Starter #1 (Edited)
I am getting a buddies '86 750 back on the road for him. It has sat in his garage since '93. I have found a few odd ball things here and there. This is a new one.
I hook up the new, fully charged battery, and the fan comes on and stays on...with ignition off. The engine has not run in 13 years, I think that it has cooled down by now.
Ground wire is secured where it is supposed to be, per the manual.
What could be causing the fan to run?

Thanks!
 

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sounds like a faulty relay that turns the fan on
 

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Pull the black connector off the fan switch on the bottom corner of the radiator. Be careful - it's easy to break off the terminal. If the fan stops then the switch is at fault. If it keeps running then it's almost certainly the relay inside the junction box which is integral with the fusebox. You are not supposed to be able to get the box apart but I managed to pry mine apart once to fix a dry joint on the circuit board. I then glued it back together & sealed it up with some silicone sealant. If it does turn out to be a problem in the juction box it could be worth looking inside to try & see what is wrong. Has the bike been stored outside at any time? If it has then the box could have filled up with water & shorted something out.
 

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Discussion Starter #5
What would cause the switch to go bad? Internal malfuction? Rust and phosphate deposits/debris on inside of radiator on the switch? Bike has sat dormant for 13 years. Coolant drained out of a lower hose after dog chewed hole into it.
Think if I take out the switch, clean it up and reinstall, it might work again?
 

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Wouldn't have thought debris on the inside of the switch could cause it to go bad but could be worth cleaning it up just to make sure. In my experience they usually fail internally in some way. Pay particular attention to the threads on the switch as that's where it earths to make it work. Did you take the connector off the switch to prove the switch was at fault? The fan should stop when you take off the connector otherwise the problem lies elsewhere. Let me know how you get on.:smiley_th
 

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Discussion Starter #7
Yes, disconnected the the wire from the switch and the fan stopped. My instructor even agreed to what you have said.
(Taking a 2yr motorcycle tech course here in Ga and have not gotten to electrical yet.)
Thanks. Will let you know, as a new switch is $77.
 

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$77! Sounds about right for any Japanese spares - i'm sure they must think of a number then treble it when they set their prices! I had to buy a new radiator for my VN a couple years ago & it was £350! (around $550). I nearly fainted when the dealer told me the price. Tried calling a few bike breakers to try & get a secondhand one but had no luck. The VN hasn't been sold here in the UK since 1995 so they're getting pretty rare now. Can never see how they justify it when I compare prices for similar car parts. I have an old Volvo 760 station wagon that I use when the weather's bad, had to replace the radiator a while ago & it was £65 (around $107) brand new & it's 4 times the size of the bike one & has an oil cooler in it for the transmission as well.
Anyway, that's enough of my ranting. Hopefully the new switch will sort it & you can start enjoying the bike for the summer.:beerchug:
 

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ehh, the prices are like that because the produce just a lil more then what is needed for the production run of bikes. very little supply+ high demand = high prices. auto parts sometimes are made in the 50% over for spares
 
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