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Wiring a thermal fan switch

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liverpool_f_
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Wiring a thermal fan switch

Post by liverpool_f_ on Wed 20 Apr 2016, 4:26 pm

Hi Gents,

Since I have had my bike, it has had a manual switch for the fan which is fine but I now want to rewire the original thermal switch in the radiator in parallel so they both operate the fan. As far as I have figured out, the fan has the live 12v and it's ground is switched via its connection to the radiator. So,

- Should the radiator be grounded and if so where?
or
-  is the radiator grounded by mounting it in the frame, which is grounded? If so where?

I have figured out the bodged manual switch wiring but I am assuming that was done because the ground for the radiator has been broken/corroded wherever that is.

Any help is much appreciated as its getting hotter and I don't want a seized engine!
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teamster1975
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Re: Wiring a thermal fan switch

Post by teamster1975 on Wed 20 Apr 2016, 7:58 pm

The ground for the radiator should be attached to the top rad fan bolt, the crimp rusts off. Very common failure point, you just need to put a new crimp on and re-attach.
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liverpool_f_
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the 900

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Re: Wiring a thermal fan switch

Post by liverpool_f_ on Wed 20 Apr 2016, 10:32 pm

Just checked it and it is indeed snapped off. Does anyone know is it much of a pain it is to spin the fan 180 degrees. Whoever installed it did it upside-down so the wires barely reach. That will make it difficult to reattach the ground wire. 

The joys of owning a bike with 15 years of other peoples bodges
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eternally_troubled
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Re: Wiring a thermal fan switch

Post by eternally_troubled on Thu 21 Apr 2016, 12:55 pm

@liverpool_f_ wrote:Just checked it and it is indeed snapped off. Does anyone know is it much of a pain it is to spin the fan 180 degrees. Whoever installed it did it upside-down so the wires barely reach. That will make it difficult to reattach the ground wire. 

The joys of owning a bike with 15 years of other peoples bodges


Shouldn't make any difference if you *rotate* the fan 180 degrees (so the air flow is still in the the same direction).

Could you not just extend the wires from the fan (admittedly you would need a soldering iron, solder and some heatshink)?

It sounds like a good idea to keep your fan switch, just in case....
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liverpool_f_
the 900
the 900

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Re: Wiring a thermal fan switch

Post by liverpool_f_ on Thu 21 Apr 2016, 6:58 pm

I could extend them but that is a pain. If loosening it and spinning it saved me the grief then thats a plan but if it is less straight forward and the bracket is all rusted and crumbly, then maybe thats the way to go
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teamster1975
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Re: Wiring a thermal fan switch

Post by teamster1975 on Thu 21 Apr 2016, 7:20 pm

You'll be lucky to get the rad bolts undone if it's been a while, give them a good soaking with penetrating oil first. It's very flimsy metal and when it rusts...
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liverpool_f_
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Re: Wiring a thermal fan switch

Post by liverpool_f_ on Thu 21 Apr 2016, 8:17 pm

Out of interest, do the bolts on the outer edges of the radiator actually contain the fluid. I might stick a new ground in there if they don't

sullivj
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Re: Wiring a thermal fan switch

Post by sullivj on Fri 22 Apr 2016, 6:26 am

No, they're for holding the plastic trim on, on the naked model. You can take them out without losing fluid.
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liverpool_f_
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Re: Wiring a thermal fan switch

Post by liverpool_f_ on Fri 22 Apr 2016, 3:27 pm

Thats awesome! I can stick my new ground wire there without having to disassemble any of the load bearing rust I have accumulated.

Thanks for the input guys

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Re: Wiring a thermal fan switch

Post by Guest on Mon 25 Apr 2016, 3:54 pm

Another technical term learned, 'load bearing rust'  Smile don't think shortcuts and fast repairs will eventually catch up? Of course time's of importance, but you know best.
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liverpool_f_
the 900
the 900

Posts : 355

Re: Wiring a thermal fan switch

Post by liverpool_f_ on Tue 26 Apr 2016, 8:30 am

Changing the position of the ground isn't a downgrade in terms of reliability/functionality. It doesn't look quite as good but my honda looks 'used' to say the least already. Plus if my new one does go bad, I can swap it out in a few minutes given its better accessibility

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