Yes their are 3 wires in early heaters orange, yellow(resistance wire) and black earth.My dads HZ caught on fire in the heater box as the rearstate is in the black plasitc box near the heater fan, this gets really hot and lots of leaf litter will cause this if left unchecked, later wb heaters dont have the rearstat in the heater box.
On my wb i connected the orange wire to a battery and it seemed to run high speed and the yellow low speed, must be a bit different to early heater fans?
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