First of all, there is no easy way. Secondly which 4cyl do you have? 2.0 Zetec, 2.0 Zetec VCT, or 2.0 SPI?
go to the dealership and get it fixed
Material and labor... about $400.
By going to a garage
3-500 dollars
Go to Napa and buy a Repair Manual.
loo on www.focushscks,com they have the full detail on how to.
just replaced my alternator on my 54 plate ford focus cost me 15 gbp used these can also be located on ebay for as little as 17.99 gbp
Go to http://www.focushacks.com/index.php?modid=45
How to replace tranmission mount
how do i change the alternator in my 2001 ford focus?
Hello. I just replace the alternator on our 2001 Focus with 70K on the odometer. The job took about an hour. However, before you replace yours, check the continuity through the electrical plug connection at the alternator. This is a weak point of the Focus and can cause the alternator to not charge the battery properly. If the plug checks good, you must replace the entire alternator (as of 12-20-06, the part costs about $165 for a rebuilt unit in South Carolina). Here are the steps: Remove the positive battery cable. Unplug the wires from the alternator and slide them from the plastic support bracket. Connect a short extension onto a 3/8" ratchet and slide the end of the extension into the square hole on the belt tensioner. Rotate the ratchet handle so as to remove the tension from the belt. Slip the belt from the alternator only. Remove the two bolts from the front of the alternator and one nut from the underside of the alternator. Hint- To ease removal of the alternator, remove the electric fan housing from its mount by pushing on the two top tabs with your fingers. Lift up on the fan housing and slide it out of its lower supports. The housing can then be moved several inches out of the way to allow the alternator to be easily removed. Install the new alternator in the reverse order.
It depends which engine you have; however, the CHT is a Cylinder Head Temperature, not an ECT (Engine Coolant Temp) and on the Zetec DOHC engined Focus this is on the cylinder head, squeezed behind the alternator where you can't really see it. Most Focuses have a CHT and not an ECT. Ben