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Originally Posted by stocktake
The biggest problem we have on this is the distance and none of us can pop round and sort it 
Would be a lot easier with the whole assembly including the RF-150 box were laid out separate from the car.
Still, my initial observations: The fan is not original and appears to be a two or three speed fan that has been converted to a single speed.
My thinking behind this is:
Black is negative
When energised then:
Green slow speed (currently spliced together)
Red medium speed (currently spliced together)
Both high speed
Then again I strongly suspect it could be simply Low/High
So, we can now take the fan wiring out of the equation.
Following the way the resistor is wired the feed from the plug goes to the control box and the circuit through the resistor is made complete when BOTH the relays are energised. this then returns to the plug.
Is it possible that the wiring in the plug then completes the path to the mysterious RL -150 box which in turn sends the power to the fan.
Quote:
I would suggest that providing the cars wiring has Not been altered upstream of the main plugs then a replacement fan harness with a modification to remove the resistor and not to splice the high and low wires together to go straight to the red and green on the fan.
EDIT: If I Remember correctly the car harness is always live even with the keys removed so care should be taken.
Edit 2: Could it be a 1.8 fan?
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HI Dave
Big thank you for getting on board
if it is a 1.8 fan its not from our model of car, don't know about the 25/45 version. the fan blades are totally different, I have just come from the shed after taking a load of photo's for Zickleer if he needs them of both the wiring for the Diesel two wire 2 speed fan, & the four wire 3 speed fan.
As you say we have to hope the main loom for the fan coming from the cars wiring as not been tampered with
PS I would like to see the black conduit removed from the wiring so we can see the wiring joint inside of it. (Photo 16 )