My zetec was doing that before I changed the alternator out. It really wasn't all that bad to do. It is a tight space, just some patience and about an hour and it can be done.
05 ZX3: Steeda intake, 67mm TB, custom 2.5 Magnaflow exhaust, Tom's Tune.
New: 04 SVT : K&N panel filter, 3 performance motor mounts, Taylor wires, orp, 67mm TB, Tom's Tune.