Thanks everyone for all the assistance in this thread and others throughout the forum.
Karl tried and checked everything however we couldn't get the sensor to operate as it should.
So I bought a new sensor unit....I know most of you just remove the damn thing and forget about the light but I like to have the light.
Anyway, you know what.....it works just like it's supposed to (happy me). The cost of the unit was $73 AUD from the local Stealer plus Karl's time (lucky I have a good rate on that...lol)