Sprint 900 Cooling Fan Manual Switch ?

Discussion in 'Sprint & Trophy' started by alan ramsay, Jul 13, 2021.

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  1. alan ramsay

    alan ramsay Member

    Oct 8, 2017
    16
    8
    forfar
    Has anyone ever done an over ride manual switch for the cooling fan ? now I am no mechanic but I would like to try as mine doesnt seem to turn on and it has almost boiled over a few times in town,I have purchased a switch which has three tabs so if anyone can tell where I should attach three wires to then I will be very gratefull....
     
  2. Hubaxe

    Hubaxe Good moaning! aka Mr Wordsalad :)

    Mar 25, 2020
    1,692
    800
    Aix Les bains - French Alps
    Hi,
    Not sure I can help, but here is what I'd do.
    You need to locate the fan switch (usually on a side of the radiator). Unplug the connector, and try to "shortcut" that connector.
    It will act like the fan switch reached the high temp.

    Before doing that I would check a few things:
    Fuses
    Directly power the fan to see it the electric motor works.
    Shortcut the fan switch as explained above. If the fan works, then you found the guilty. The fan switch (around 20 bucks)
     
  3. alan ramsay

    alan ramsay Member

    Oct 8, 2017
    16
    8
    forfar
    Hi , fan works but doesnt come on, yes i know about the fan switch or thermostat but honestly for peace of mind I would rather have a manual switch to save overheating in traffic,I really just want to know what wire and where ,I have found the connector but have no idea which colour of wire i need to splice into and what else to connect to the switch ,thanks Alan
     
  4. Cyborgbot

    Cyborgbot Guest

    One wire in each hole - what could possibly go wrong?!?

    9975C0C0-4331-4269-B28C-08B531448B0E.jpeg
     
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  5. Hubaxe

    Hubaxe Good moaning! aka Mr Wordsalad :)

    Mar 25, 2020
    1,692
    800
    Aix Les bains - French Alps
    I would just insert your manual switch on the 2 poles of your fan switch (more conveniently on the 2 wires of the fan switch connector). That way the fan will work as normal, but you can also force the fan with your switch. I used that exact same principle on my old VW T25 to switch the fan on before hill climbing.
    Here is a little drawing to explain.
    thumbnail_IMG_2913.jpg
     
  6. Yorkshireman

    Yorkshireman Crème de la Crème

    Dec 12, 2015
    3,401
    1,000
    Barnsley
    Red to red
    Black to black
    Blue to bits:confused:
     
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  7. alan ramsay

    alan ramsay Member

    Oct 8, 2017
    16
    8
    forfar
    I shall give it a go ,do I not need to ground the switch ? it has three spade connectors on its underneath ,thank you very much ,it is appreciated ?
     
  8. Hubaxe

    Hubaxe Good moaning! aka Mr Wordsalad :)

    Mar 25, 2020
    1,692
    800
    Aix Les bains - French Alps
    I would unplug the connector to check how many connectors you have on the fan switch itself.
    This fan switch is usually a 2 pole contact. You'll need to find the wires that go to the poles. And you don't need to ground your switch.

    There is maybe another interesting solution. It's sometime possible to find fan switch with a lower "switch on" temperature.
     
  9. Erling

    Erling Elite Member

    Dec 12, 2017
    1,123
    943
    Norway
  10. alan ramsay

    alan ramsay Member

    Oct 8, 2017
    16
    8
    forfar
    Thanks to all for the help , my switch is installed on the fairing and looks factory and works a treat ...thanks again ....
     
    • Like Like x 2
  11. alan ramsay

    alan ramsay Member

    Oct 8, 2017
    16
    8
    forfar
    I have just done it by attaching spade connectors to two wires ,splicing the switch in the middle of one wire , two spade connectors to the fan switch connector which has only two connections and straight to the battery ,sorted and as I said it looks great , I grounded the spare switch connector to the frame , all done and again thanks as I struggled with this but after reading all your advice it was really easy ,cheers guys ....
     
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  12. Cyborgbot

    Cyborgbot Guest

    Really not sure why you grounded the other pole. That is for if you wanted to switch something else ie fan one way and a light the other way as you flip the button.

    Im trying to figure out if this is a bad thing or a doesn’t matter thing. I’m kind of erring on doesn’t matter, other than it might confuse a future owner as they won’t know what it’s doing. Also if the switch fails it could cause some odd behaviour I.e always on if shorted from live to the second ground. Unlikely but would be a bugger to find if you forgot what you did.
     
  13. alan ramsay

    alan ramsay Member

    Oct 8, 2017
    16
    8
    forfar
    Thanks for that ,I concur with your thoughts and have removed but as I had the tank off I decided to look in and was horrified so the Tank is getting cleaned and coated inside.....great start to my ownership but hopefully we can get it sorted and have a beautiful bike to ride for a few years ,thanks to all once again
     
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  14. Yorkshireman

    Yorkshireman Crème de la Crème

    Dec 12, 2015
    3,401
    1,000
    Barnsley
    As our friend @dilligaf used to say, them wiggly amps, work of the devil:p
     
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  15. Aidan

    Aidan Well-Known Member

    Dec 31, 2018
    183
    93
    Essex
    I'm no auto-electrician, but I think I would check that the electric fan wiring is not still live when the ignition is turned off - otherwise you risk leaving the fan on and draining the battery. I'm pretty sure my sprint fan turns off when ignition is off, but worth a check.
     
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  16. Rog

    Rog New Member

    Apr 14, 2019
    5
    3
    Forest of Dean, UK
    My '96 Sprint fan runs on for a short while after the ignition is turned off. Looking at the circuit diagram in my manual, the blue/black wire on the fan thermal switch seems to go via a fuse in the fuse box to the battery positive. The blue/white wire goes to the fan.
    upload_2021-7-28_15-27-39.png



    As Aidan says, check before hard wiring a switch.
     
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