Okay, I searched this and couldn't find much for a conclusive answer.
2000 jeep tj, 4.0 i6, 5-speed tranny.
My signal relay has been acting crazy and i cant figure it out. First i had the OEM flasher relay and it was clicking very fast like i had a signal light out. It would only click fast like that when i wasn't using the signals or hazards. If i flicked either of them on to use them they work perfectly like normal.
Logically i thought i needed to replace the flasher relay, so i did. I got the new one in and the problem was gone for maybe 10 min. Then the new relay, instead of clicking fast, started buzzing like crazy. I replaced all turn signal bulbs because i found a post saying it could be corrosion. nothing changed.
Any ideas? The signal still works like normal, i just have to put up with intermittent, and incredibly annoying buzzing noise.
First thing I would check, is the ground connection on the flasher relay itself. The black wire is a ground. Try using a jumper lead from there to a known good ground and see if that solves the issue. If not, the flasher gets it's power from the hazzard/normal switch (red/white wire), then delivers it back to the turn signal switch via the pink wire so there's a posibility that one of those switches is malfunctioning and both are within the multifunfuntion switch.
My relay started clicking like crazy after a very over-zealous high pressure washing under the fenders. So I'm guessing water got in the fender lights.
Clicking became less and less random then eventually stopped after 7/10 days.