1 RECALCITRANT THERMO FAN Thu 07 Feb 2013, 22:08
Giddyup
active member
Having just got the bike going again, with a lot of help from the resident keepers of the knowledge and sleuths, I now have another Quest.
To solve the case of the "will not work" thermo fan.
The story so far:
Can get the bike upto temp, but no fan kicks in. I think from memory, I once rode it long enough to illuminate the over-temp warning light on the dash.
I got hold of "Fan System Diagnostics for Two-Valve K Bikes" by Jeff Dunkle. (http://www.ibmwr.org/ktech/fan-diagnosis.shtml), and went through it step by step.
Removed seat and tank, exposing relay nest. Removed white relay.
Did the fan motor test: jumper wire from connectors 15 & A2 - fan spins nicely.
Did the Over temp warning light test - all good.
Temperature Probe Test - Nothing...no movement on the multi-meter.
Tried disconnecting connectors from temp sensor and hot-wiring - Nothing - fan should spin.
Measured voltage at connector 15 - in that big terminal block at the very front of the frame - 12 volts when ignition turned on and 15 bridged to A2.
I admit that I'm an electrical idiot, and this is really doing my head in.
I think there must be a broken wire between the big terminal block and the fan itself (about 75mm of wiring), but that does't explain why hot-wiring the temp sensor wiring is not kicking in the fan, or that the temp sensor test is a failure.
What am I missing??
To solve the case of the "will not work" thermo fan.
The story so far:
Can get the bike upto temp, but no fan kicks in. I think from memory, I once rode it long enough to illuminate the over-temp warning light on the dash.
I got hold of "Fan System Diagnostics for Two-Valve K Bikes" by Jeff Dunkle. (http://www.ibmwr.org/ktech/fan-diagnosis.shtml), and went through it step by step.
Removed seat and tank, exposing relay nest. Removed white relay.
Did the fan motor test: jumper wire from connectors 15 & A2 - fan spins nicely.
Did the Over temp warning light test - all good.
Temperature Probe Test - Nothing...no movement on the multi-meter.
Tried disconnecting connectors from temp sensor and hot-wiring - Nothing - fan should spin.
Measured voltage at connector 15 - in that big terminal block at the very front of the frame - 12 volts when ignition turned on and 15 bridged to A2.
I admit that I'm an electrical idiot, and this is really doing my head in.
I think there must be a broken wire between the big terminal block and the fan itself (about 75mm of wiring), but that does't explain why hot-wiring the temp sensor wiring is not kicking in the fan, or that the temp sensor test is a failure.
What am I missing??