Right so normal day driving rear brake lights work fine.
When driving and turning on side lights I loose power, even if I put my foot flat to floor. Quick lift if the pedal and back on and its fine.
But with the lights on the rear brake lights are constantly on, all three. Its as if power is sent to brake lights instead of night lights. Makes no difference if I push brake pedal or not.
I did discount both rear lights and the centre boot brake light then started to work as normal (lights still turned on)
It does have something wired in, its got light bulb bypass wrote on the box and has a fuse. I pulled out the fuse but still no change.