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post #1 of 12 (permalink) Old 05-02-2013, 02:24 PM Thread Starter
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Fan test circuit

I managed to get my fan test circuit installed yesterday. It was a public holiday over here and great weather so I took the opportunity to put everything together.

It's a very simple design, I bought a ready made relay delay circuit off ebay which has a variable delay and can handle the current.

The idea being that when the ignition first comes on, the circuit turns the fan on for 3 seconds to let me know that it's still working, and also to give it a bit of exercise - ie stop it seizing up from lack of use during the colder months.

Here's how I wired it in -



I'm not proud to say that I wired the +ve feed to the circuit to the +ve feed for coil #2, I really should have ran a wire down to the fusebox as I really don't like interfering with the coils at all!



But this is really an initial test to see how it goes, so I will change it and wire it in properly once I'm happy that it works without any problems.

It has worked well so far, and I got stuck in traffic again today so at least I know that the fan operates as normal, although I did see the temp gauge get to 100°C for the first time ever, so that's concerning me a little.

I'll keep an eye on it and see how it goes, but I just bought the VW fan switch (with the lower activation temperature) as well and I'll put that in as soon as it arrives.
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post #2 of 12 (permalink) Old 05-02-2013, 04:07 PM
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Are those scotch lock splices? Ugh


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post #3 of 12 (permalink) Old 05-03-2013, 02:47 AM Thread Starter
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lol dunno what they're called, but yeah I agree they're not very friendly. The whole thing is really setup as a test right now, plus I forgot to take my roll of solder with me when I went to the garage so I had to bodge it a bit - not upto the the usual ArferBrick standard of work I know .

If I decide to keep it then I'll need to put the circuitboard into a nice plastic container, and connect all the wires up properly.

Don't panic, don't panic!
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post #4 of 12 (permalink) Old 05-03-2013, 04:49 AM
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Hehe, no worries Arfer, just wouldn't recommend those scotchlock things on a bike. Solder & heat shrink tube is best & neatest imo, tho' crimps with a proper tool are fine too.

Anyhow, that's quite a cool idea to test (& spin) the fan. You weren't tempted to try & fit a manual fan switch? (I know it's tricky to mount on an unfaired bike.)


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post #5 of 12 (permalink) Old 05-03-2013, 05:18 AM Thread Starter
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Funny you should say that, I have been thinking of installing a manual switch too .

That would mean yet another relay and wires going upto the bars, and I'm really not keen on that. I guess I could put the switch somewhere under the tank where it's easily reached, but not too keen on that one either.

I think an indicator light would be a good thing, I might embark on making a new speedo holder plate with LED bezel lights on it, then I could simply add one for the fan so I know when it's running. It's a pain having to look down at the fan to make sure!
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post #6 of 12 (permalink) Old 05-03-2013, 07:10 AM
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Or you could use the oil pressure indicator light. That light is hardly worth having imo. Just about any genuine reason for a pressure warning (as in 0 psi) & the engine is knackered anyway.


98 Tbird tank/seat, Sprint fairing, ZX7R forks+Racetech Gold Valves, 08 ZX6R shock, short sw/arm, Alcon 6-pots, Ignitech+TPS, T'bike 3-1+Beowulf can, airbox/jet mods, tubeless wheel mod, lots :) per mile, 55mpg ave(imp)
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post #7 of 12 (permalink) Old 05-03-2013, 07:12 AM
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Tho' changing it to a fan light would cause havoc with anyone else riding the bike, if they weren't told


98 Tbird tank/seat, Sprint fairing, ZX7R forks+Racetech Gold Valves, 08 ZX6R shock, short sw/arm, Alcon 6-pots, Ignitech+TPS, T'bike 3-1+Beowulf can, airbox/jet mods, tubeless wheel mod, lots :) per mile, 55mpg ave(imp)
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post #8 of 12 (permalink) Old 05-03-2013, 09:29 AM
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Leave it to an Irishman to point out the Scottish loch connectors...

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post #9 of 12 (permalink) Old 05-03-2013, 12:18 PM
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Sure, an improper use of the Scottish lochs. They are supposed to be for fishing & supplying distilleries only


98 Tbird tank/seat, Sprint fairing, ZX7R forks+Racetech Gold Valves, 08 ZX6R shock, short sw/arm, Alcon 6-pots, Ignitech+TPS, T'bike 3-1+Beowulf can, airbox/jet mods, tubeless wheel mod, lots :) per mile, 55mpg ave(imp)
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post #10 of 12 (permalink) Old 05-03-2013, 01:05 PM Thread Starter
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Nay laddie, they be fer Monsters!!
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