gu TD 4.2i dx brake light issue

[Mack88]

gday all my names ben ,
i own a gu TD4.2i dx and ive recently got problems with my brake lights staying on aswell as the electric towing brakes inside the cab.
can someone please steer me in the right direction

cheers , Ben

[MQ MAD]

Brake lights comin on and off
What i do with my electric brake controller is disconnect the feed wire to the brake pedal switch
When i need/use the trailer i just hook it back up

Dont know why this happens the last patrol with electric brake controller did the same