Where does this mount to the bike? Can you write up a brief installation How-to (or even just show the stock part that will be replaced in a photo) for those of us not familiar with the stock unit? I'd really like something like this that will kick on the fan at a lower temp - I've only had one or two times when I was worried (both on hot days in stop-and-go traffic just like you said), but it sounds like this would take care of that.
I'm afraid I've not figured out being able to draw up neat custom wiring diagrams to put on the web. But this is a fairly simple job.
The fan switch faces out to the right & horizontally off the coolant filler/thermostat housing mounted on the top of the main frame tube under the tank. The switch is just to the rear of the coolant overflow/reservoir 'bottle'.
This is the type relay you want (bog standard, euro style 'micro' lighting relay):
These are smaller than the standard relays
and have a different pin layout.
No brackets on these relays.
With diode protection for sensitive circuits.
Pins 30 & 87 are 6.3mm
and pins 85, 86 & 87a
are 4.8mm blade.
23x15x25mm (excluding pins).
Note the use of the smaller size, 4.8mm blade terminals!
The '4-blade' will do. I'd be sure it could be zip tied to the frame tube behind the thermostat housing & coolant overflow bottle with plenty of clearance for the fual tank to fit over.
The existing loom wires are unplugged & then connected to terminals 30 & 87 on the relay (either way round). Then, using a 'piggy back' crimp, connect a wire (smallest loom gauge is fine) from the terminal with the Blue/Black wire to one of the new fan switch terminals (by soldering).
(Note the Blue/Black wire is 12V positive all the time, even when the ignition switch is off - so disconnect the battery 1st before doing any wiring on this.)
The other fan switch terminal is then wired to one of the relay coil terminals - must be terminal #86 in this case as there's a diode connected internally.
Relay coil terminal # 85 is then wired to ground. A suitable option using a ring crimp is maybe an ignition coil mounting bolt or a thermostat housing mounting screw.
Reconnect the battery & bridge the new fan switch terminals together to test that the relay energises & fan starts running.
Tape up any exposed or potentially exposed parts of the connections & that's it.
I guess a photo of the area under the tank would be useful?, but, as I say, I fitted my relay under the fairing. (I left the toggle switch in circuit in mine because it has an LED in the toggle top which indicates both when the switch is on or fan relay is energised by the temperature switch.)
Anyhow, does this enable you to understand how to do it?