This might help....
Did mine yesterday, alternator cost $96.00. The engine does not need to come apart, just some items on firewall above the alt. and coolant resv.
go to the dealership and get it fixed
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Material and labor... about $400.
on raiht between the motor and the fire wall
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
loo on www.focushscks,com they have the full detail on how to.
Go to Napa and buy a Repair Manual.
Remove the alternator belt from your 2003 Ford Mustang alternator. Remove the wiring harness from the alternator. Remove the alternator retaining bolts. Reverse the process to install the new alternator.
Go to http://www.focushacks.com/index.php?modid=45
autozone.com repair info
Around $400 for a new install.
The 2003 Ford Focus has 16 valves.
You can not replace it unless it's an old ford focus.
In the alternator. Have to replace the Alternator.
I replace engine but now it wont start.
unbolt it, yank it out, put new one in, bolt it.
The 2003 Ford Focus has an inline 4 engine.