Blinkers

[HSVKILLA]

I am currently fixing a few things on an Au 1999 falcon forte wagon at the moment and have come across this strange happening.We got a new battery for it and after hooking it up the blinkers(indicators) randomly just flash for awhile then stop then randomly just flash out of nowhere,it had been parked up for a couple of years and did it with the old crappy battery too,can anyone shed some light on what this means or why this is happening,cheers.