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.

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

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

no you need to have it setup to bypass the switch

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

Why do you want a manual fan switch , unless of course its to keep the flies away while your parked up having a beer

G,

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

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:

Ah ... Im not sure I understand the logic there Warick ( faark man , how diplomatic was that ! ) 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

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