Just looking at wiring in my screen heater and I thought it was 2 speed but I now have my doubts. There are 3 wires to the fan assy and 1 goes to a 1.4 ohm resistor in the housing. Anyone know why the resistor is there? This would dissipate about 100W?

I bought the unit second hand off ebay and it is a westfield one....

Thanks
Dave B

do you have a photo of the areas with the three wires going into it and what attaches to the other end of the wires, it might help to identify ?

***EDIT***

i guess you dont know what goes on the other end if you bought it second hand oops

[Edited on 30/8/08 by novacaine]

my westy heater is the same,

the resister is a reostate the takes up the extra power between the speeds.
so it works 2 speed

iirc the red is common,
the orange is slow speed (goes to the resister)
black is fast speed.

some also have a blues wire linking between orange and black with a suppresser inline.

So are you saying then that you switch the returns? Have you run a relay for the heater?

thanks
Dave B

resistor will be there to step the voltage, and give 2 running speeds

Thanks for all the help... Turns out the Black is the fast speed, red is the slow speed and Orange is the return. Very strange colour coding! Has anyone bothered with a Relay.. Fan only draws 2.8 Amp Max....

Dave B

no relay in my westy loom.

thanks
Dave B