FAN ; ELECTRIC ; old R3W Post
Below are a couple of extracts posted by forum member " wheaters " from the old lost post above relating to fans , thermostats & relays
xxxxx
Try here, for a start:
http://cgi.ebay.co.uk/Motorbike-Uni...04?pt=UK_Motorcycle_Parts&hash=item20b2c7440c
I wired in a similar fan (mine was a Pacet, costing over £100; wish I'd seen the ones above first!) using one of the thermostats in the link below, fitted in the bottom hose (yes, bottom hose, not top). The Reliant bottom hose is 25mm i.d.
http://cgi.ebay.co.uk/TOP-HOSE-THER...arts_Vehicles_CarParts_SM&hash=item1e5a9b5d4c
Works perfectly but must be wired through a relay because of the high current load of the fan motor. I used a fused relay for simplicity.
http://cgi.ebay.co.uk/12V-4-PIN-30A...arts_Vehicles_CarParts_SM&hash=item588a51dcf7
xxxxxx
My logic for fitting the sensor in the bottom hose is that the water travels down through the radiator on its way back to the pump. It gets cooled considerably by the time it gets to the hose. Most of the time, the radiator gets enough air to cool the flow so the fan isn't needed.
On the other hand, the coolant in the top hose hasn't yet been through the radiator so fitting the sensor there would bring the fan on much more often, when it perhaps wasn't actually needed.
Another reason is that it's so much easier due to the extra length of the bottom hose.
xxxx