benofbrum wrote:I used one of those Rover resistor units and mounted it on the side of the battery box with the plastic mounting uppermost and open on the sides. When I went to the classic car show at the Bath and West showground, the demister was on all the way down from Birmingham on the middle or low speed with no problems. Remember, even on the lower settings, most of the power will still be dissipated in the heater motor and at full power, no current goes through the resistors.
Thanks for the prompt feedback and advice, eBay hear I come, you must agree having the one speed fan is a bit primitive and while I'm sorting the electrics and got the heater and dash out I might as well try and upgrade it.
cheers.