alright so, brake pedal = parkers on front and rear brake light. head lights on and..

[budgieVH]

okay so i have had this prob for a while

when at day when ever i brake my front parkers come on and the right indicator will stop flashing when i brake.

when driving at night with head lights on the right indicator stays on. no flashing just a dim light. and sometimes brake lights dont work..

hahaha got any solutions??

[SL/ENUT]

Clean all. ALL earth points. Also look at earth wires.

[TY318]

part of it could be the relay thats is grounded behind the drivers headlight i had a probs where my headlights wernt coming on and the earth was loose

[drewVHSS]

I had same issue in the VH SS, turned out one of the two black earth wires in the socket side of the headlight harness wasn't seated properly into the pin. solved that issue real quick for Headlight and left blinker issue,
I'm guessing your brake light /blinker issue would be very similar, i.e. bad earth, very common with vb-vh commodores, many cars i've seen have added in seperate earths directly from the globe holder base to the rear beaver panel (which explains why my brother did the same on mine before he sold it to me 12 years ago, never had a tail light issue ever in the time i've owned the car)