recently my running lights and turn signal lights stopped working on my 70 coupe. my gauge lights would flicker and my headlight switch would make a ticking sound. i replaced the light switch thinking this would fix my problem, but it didn't. Any Ideas?  

Kinda hard to tell.  I'd check the engine harness connector where it goes into the firewall, the harness connection on the back of the printed circuit board for the dash and start checking every ground wire, screw, etc.  My first thought would have been the headlight switch too.  

Ya thats what i was planning on doing. Thanks for the help  

While I would suspect the light switch as well, don't rule out the turn signal switch and wiring in the column. The brake/turn light signal goes through the column and you might have some sort of broken/loose wire or intermittent short in there too. 38 year old wiring in a vibrating column with a rotating shaft down the middle can cause problems!

HTH...
Mark  

I made an error on my first post, my turn signals do work. Its just my running lights that dont work. I do think a wire or a gound came loose.....thanks mark  

This may sound like a dumb question , but have you replaced the dimmer switch ?  

If you need  - you can find wiring diagrams here: Vintage Mustang Wiring Diagrams  

No i haven't...would that affect anything?  thanks for the wiring diagrams