niallpeters1 Posted February 27, 2015 Report Share Posted February 27, 2015 Fan is not working on the bike Replaced fan motor Rectifier and bridged the switch to see if it will work can anyone shed any light? I'm unsure on what voltages I should be getting at fan etc? Cheers in advance Quote Link to comment Share on other sites More sharing options...
copemech Posted February 28, 2015 Report Share Posted February 28, 2015 (edited) Fan runs on 12V DC. Ac output from magneto lighting coil(yellow) is connected to both a rectifier and a regulator(square and rectangular boxes) and if either is faulty fan will not run. If regulator is shorted out it will earth out the voltage. Then you have the thermo switch(which I suppose you have jumpered), and finally the fan motor must have a proper earth. Upon further thought I will place an addendum, as I believe the regulator can be temporarily disconnected from the system for testing, but only at idle as its job is basically to shunt off excess voltage to earth at revs, as the faster a mag spins the greater the voltage created. Output is limited at idle normally, but revving and excess voltage may not be good for things. Once warm, the bike should start and run at idle even with tank off. With thermo switch jumpered fan should run immediately if things are right. Edited March 1, 2015 by copemech Quote Link to comment Share on other sites More sharing options...
niallpeters1 Posted March 4, 2015 Author Report Share Posted March 4, 2015 Tried a new regulator and still no joy mate Quote Link to comment Share on other sites More sharing options...
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