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Join Date: May 2006
Location: Tampa, Florida
The fan can run at any time with or without the key in. The switch in the bottom of the radiator grounds the lead to complete the circuit.
If you pull the wire off the switch and ground it, the fan should run, no matter what.
If yours runs with the wire attached when it shouldn't (3 AM ???), it has a short to ground somewhere, most likely bad switch in the bottom of the radiator. Yes you can plug it in when riding to be sure its cooling then unplug it not to drain the battery. Don't suggest a lot of slow riding, or extensive idling as the fan draws a good deal of power to run and you don't want to tax the charging system at low stator output rpms.
93VN750, under re-construction
vn750.com Member # 828
Rick's Stator and R/R
MF AGM Battery
Shaved & Jetted
MAC Tapered Staggered Pipes
Stainless Steel Brake Lines
23,XXX miles and holding pending gasket change (underway!!!)
Last edited by 93VN750; 05-01-2007 at 09:30 PM.