Thanks everyone for your help. The suggestion to try simple things first was spot on.

fasteddy -- you're the man <img src="/forums/images/graemlins/kewl.gif" alt="" />. I've cleaned battery posts and terminals and the problem went away. I hope it stays this way.

Now, I need to fix the ignition switch as it is getting harder and harder to start her up. Does anyone know where I can find the part?

Thanks.