Hi pplz, I would also like to add my $0.02 worth...
I have been having the same problem for a number of months now with the lights working whenever they feel like it & switching on & off when going around corners. So after reading this thread I considered purchasing a new/used indicator but found that these items aren't as cheap as I thought they would be.
I decided to remove the indicator stalk assembly to investigate. When I removed the indicator assembly, I found that the connector pins to the harness on the steering column was ok. So I proceeded to removed the bottom of the assembly which has the printed circuit board component (the bit with the connector pins) with a small flat blade screwdriver. When I took this bottom off, I noticed that the solder joints associated with the headlight circuit where fractured ie dry solder joints = bad connection/intermittent operation. After seeing this, all I did was gave the board a clean, re-soldered all the solder joints, gave the contacts a bit of a clean & a bend, whacked on sum silicon grease on for lube & put it back together...problem fixed!
BTW, all up it took me about 45 mins to remove, repair & fit the indicator stalk
Cheers