Turn signals

What's it doing? If the light just comes on and stays on until you turn it off, then you probably just need a new combination flasher (the thing that makes the clicking sound). It should be a cheap enough part (maybe $20-30) at the local parts shop. You can also often find them on Amazon for a little cheaper.

Also, there is no V8 option for the 99 Cherokee. I'm assuming that you mean that you have a Grand Cherokee (which does have an optional V8). Please let me know if I'm wrong here. I've attached detailed information for replacing the flasher on the 99 Grand Cherokee V8.

Good luck and let us know what else we can do for you.