I have a 2001 1.6 Focus Zetec with a couple of problems that I think may be related.

When it's cold or damp I can hear the doors clicking trying to lock themselves. I have read before to try putting dielectric grease on the terminals of the terminal multiblocks inside the doors, which I tried but didn't work.

The second and more important is sometimes the car won't start. When turning the key the dash lights come on and I can hear a click but no turn over. By repeatedly trying the key in the ignition the car will eventually start as if nothing was wrong, ie no slow turn over like the battery was dead (which I have checked with a multimeter and it is fine). Sometimes it will only take a couple of tries and the next time it could take up to 15 minutes of trying.

Can anyone offer any answers or suggestions please?