[Frost__2001]

I've had that happen 3 times on 2 different foci. I take it your driving a 2000 - 2004 model year with a zetec?

if So open your hood under good light, and lean WAY in and look at the wires at the back of the altenator that feed into (it's between the firewall and altenator so it's really back there). look for weathered, or rusting, or wear, or any corrosion on the wires in the back of the plastic clip as they rot there... if you see any wear it's a general sign it's time to replace the altenator wire harness, but Warning to you if you touch the wires they may break off.... and if they do you'll have about a week if your battery is fully charged before you drain the battery as it's one of the wires that helps recharge the battery. I went a few days like this but if the wires break, you can put a little tape there to hold it in place until you can get it replaced.

I'd highly not recommend you try to fix this yourself, as the positioning of the wires and how it plugs in, is in a very okward place, and it's a cheap dealership fix.

So, the Good news is it's only $80 for ford to replace it. I've done it 3 times now, and I can tell you it's something that generally happens every 5 years or so