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 Post subject: wiring manual fan switch
PostPosted: Sat Oct 05, 2013 3:19 pm 
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Joined: Wed Mar 25, 2009 12:06 pm
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Location: Brisbane, Australia
model: 906 Paso
year: 1990
I have just wired up a manual fan switch, But I am a bit worried about my + wire direct from the battery. Has anyone spliced into the run switch or ignition switch wires? If so how? My guess is I could strip a piece of wire bare near the front connector (e.g., the run switch YG) and solder and shrink wrap it). Just wondering if anyone else has done something like this?

The reason I am worried about the direct wire from the battery is because it means:
a) someone could come along and flick the fan switch while I was away from the bike and leave it running. No key needed!
b) There are a lot of wires in the front area, so if there was some kind of short sparking starting with smoke from that manual fan switch wiring, turning off the ignition or the run switch would not stop the problem - could even be the cause of some fires that have happened to others.

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 Post subject: Re: wiring manual fan switch
PostPosted: Sun Oct 06, 2013 11:46 am 
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paso grand pooh-bah
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Location: Melbourne Australia
model: 907 I.E.
year: 1992
it wouldn't be too difficult to find a +ve wire that has power only when the ignition switch has been switched on, it would only take 5min with a multimeter...I'm not familiar with a 906 but you should have those large 'jones plugs' near the steering head, check through the top of plug (with volt meter) to find a +ve that is only on with ignition, and do a piggy-back connection.
the other benefit is this connection would most likely be after a fuse, the fan motor doesn't draw too much anyway

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 Post subject: Re: wiring manual fan switch
PostPosted: Sun Oct 06, 2013 11:58 am 
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paso grand pooh-bah
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Location: Hilltown,Pennsylvania
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Why not just tap into the fan switch ? That way you can retain the cooling fan switch function just have the option to turn it on yourself

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 Post subject: Re: wiring manual fan switch
PostPosted: Mon Oct 07, 2013 2:18 am 
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Location: Brisbane, Australia
model: 906 Paso
year: 1990
higgy wrote:
Why not just tap into the fan switch ? That way you can retain the cooling fan switch function just have the option to turn it on yourself


I tapped into the blue wire that goes from the fan switch to the fan - which should still retain the cooling fan, aye?

There was a spare output tab from a relay that I have for the coil relay, so I have used that - so, good now the ignition has to be on for the fan switch to work :-)

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 Post subject: Re: wiring manual fan switch
PostPosted: Mon Oct 07, 2013 10:40 am 
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paso grand pooh-bah
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no you need to have it setup to bypass the switch

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 Post subject: Re: wiring manual fan switch
PostPosted: Mon Oct 07, 2013 11:15 am 
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Location: Brisbane, Australia
model: 906 Paso
year: 1990
higgy wrote:
no you need to have it setup to bypass the switch


How would I do that, Higgy?

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 Post subject: Re: wiring manual fan switch
PostPosted: Mon Oct 07, 2013 10:44 pm 
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paso grand pooh-bah
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Location: Hilltown,Pennsylvania
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First do you have a one wire or two wire fan switch ? Its on the manifold above the fan.
If one wire just pig tail it to a ground, don't put it inline

If 2 wire pig tail between the two wires

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If it ain't broke keep fixin it till it is
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92 907ie


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 Post subject: Re: wiring manual fan switch
PostPosted: Tue Oct 08, 2013 5:08 am 
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paso grand pooh-bah
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Location: Newzealand
model: 906 Paso
year: 1990
Why do you want a manual fan switch , unless of course its to keep the flies away while your parked up having a beer :D

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 Post subject: Re: wiring manual fan switch
PostPosted: Thu Oct 10, 2013 12:58 pm 
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Location: Brisbane, Australia
model: 906 Paso
year: 1990
higgy wrote:
First do you have a one wire or two wire fan switch ? Its on the manifold above the fan.
If one wire just pig tail it to a ground, don't put it inline

If 2 wire pig tail between the two wires


I have a two wire fan switch. Like this?

OOps that was wrong, so I have taken the pic off :-(

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Last edited by romus on Sat Oct 12, 2013 12:01 pm, edited 5 times in total.

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 Post subject: Re: wiring manual fan switch
PostPosted: Thu Oct 10, 2013 1:20 pm 
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model: 906 Paso
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Mc tool wrote:
Why do you want a manual fan switch , unless of course its to keep the flies away while your parked up having a beer :D


I think it is because in hot weather and eg in a traffic jam the bike overheats even with the fan - especially when the radiator is a bit old. So if you switch the fan on a bit earlier then (because its working from a cooler start, it keeps the temp under control. Same as if the thermostat opened at a lower temp.

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 Post subject: Re: wiring manual fan switch
PostPosted: Thu Oct 10, 2013 2:02 pm 
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paso grand pooh-bah
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Location: southern Germany
model: 750 Paso
year: 1987
Quote:
I have a two wire fan switch. Like this?
Image


No. Use a manual on/off switch with two contacts (and there`s no need for a ground connection on the switch unless it`s illuminated. If you`d toggle the switch on your drawing to the right you`d connect the battery + to ground!). Then connect the output of the switch to the wire that goes from the original switch to the fan (hence to the right contact on your picture)
If you have manual switch with three contacts just use two and let one of the outer ones unused (again if it´s not an illuminated switch which I`m assuming it`s not).

G.


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 Post subject: Re: wiring manual fan switch
PostPosted: Thu Oct 10, 2013 2:48 pm 
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Location: Brisbane, Australia
model: 906 Paso
year: 1990
G,

Like this? Actually, I do have an illuminated switch.
Image

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Last edited by romus on Thu Oct 10, 2013 3:07 pm, edited 1 time in total.

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 Post subject: Re: wiring manual fan switch
PostPosted: Thu Oct 10, 2013 3:02 pm 
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paso grand pooh-bah
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Location: southern Germany
model: 750 Paso
year: 1987
yes, that`s it. If you toggle the switch to the left the circuit is open and if you switch it to the right you`re bypassing the original switch and the fan will run.

Your switch may have some printing on it like this one:
Image


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 Post subject: Re: wiring manual fan switch
PostPosted: Fri Oct 11, 2013 8:04 pm 
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paso grand pooh-bah
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Location: Newzealand
model: 906 Paso
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Ah ... Im not sure I understand the logic there Warick ( faark man , how diplomatic was that ! :lol: ) Mine gets hot in traffic too and eventually , if nothing is moving , I have to switch it off as it starts spewing out water . however I always put that down to the fact that my resivor cap is rooted and doesn't seal at all ( its only there to keep the coolant in when I get airborne ) and Im pretty sure the radiator is clear ( flushed it with the weed sprayer pump on the back of the tractor ) , having said all that it has only happened twice in 7 years so ( knowin me ) I aint likely to panic :D

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 Post subject: Re: wiring manual fan switch
PostPosted: Fri Oct 11, 2013 11:06 pm 
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paso grand pooh-bah
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Joined: Tue Jul 29, 2008 9:50 pm
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Location: Hilltown,Pennsylvania
model: 906 Paso
year: 1990
if the bike is overheating replace the fan switch and check the radiator and thermistat.

putting a switch in one side or the other of the fan switch circuit will not turn the fan on, it will just keep the fan switch from working. you have two choices, wire the power supply to one side of the switch and the other to a ground or pigtail from both wires through the switch, in effect replacing the fan switch but allowing the fan switch to still operate normally

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Ducati,making mechanics out of riders since 1946
There's no problem so bad that a little fixing can't make it worse! : )
If it ain't broke keep fixin it till it is
88 750
90 906
92 907ie


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