2003 Ateva headlight/radio dimming when braking or indicating

[ade]

HELP PLEASE!!

Love Toyotas and have just bought my best yet - 2003 Camry Ateva 137,000kms auto 2.4 4cyl

Immediately upon leaving the dealership in Sydney, with headlights on, noticed them dim when I hit the brakes, also when I indicated.

Stopped, had a look at actual lights, lifted the bonnet etc - then it suddenly stalled. Thankfully it immediately started again and I continued the 2 hour drive to Newcastle. It didn't do it again.

Into an auto electrician the following morning who discovered a broken wire in the tow-bar wiring loom that appeared to be shorting out on the actual tow-bar.

Picked the car up, happy and optimistic that the problem was gone - BUT no such luck. Within a minute of driving from the auto electrician - the radio cuts out (sound and lights) for a second, the headlights dim when the brake-pedal is touched and the blinkers used. At other times it just does it all by itself!

Have just now done much googling and reading forums and blogs. NOBODY has an answer!! Lots of people have had this issue but nobody has posted a solution. Am I to believe that there is none???

PLEASE HELP. ALL YOU CAMRY OWNERS OUT THERE - THERE MUST BE A SOLUTION!! SOMEBODY SOMEWHERE MUST HAVE DONE SOMETHING THAT REPRESENTS A SOLUTION TO THIS VERY ODD, UN-TOYOTA MYSTERY.

I await your assistance asap ........

Thank you,

Austin