I got 04 ford focus good battery alternator but no charge also i check fuse box next t the battery and the other inside the car everything is good but my alternator still dont charge

Checking for B+ volatge at the heavy gage wire on the back of the alternator an the smaller gage red wire in the connector pin #3 . Without B+ voltage at those wire's it won't work . The other two wire's in the connector come from the PCM - engine computer . Computer controlled charging system .
Ford Smart Charge System Alternator Not Charging
Ford PCM controlled alternator testing

Did anyone hook up a scan tool an check for DTC'S - diagnostic trouble code's ? Charging system controlled by the PCM - engine computer .

Is the battery symbol lit on the instrument cluster ? Check fuses F1.26 30amp in the battery junction box , fuse box near battery in the engine compartment . Also check F2.27 10amp fuse in the central junction box , inside passenger compartment under the dash . It won't charge without voltage on this fuses . Also the heavier gage wire on the back of the alternator should have battery voltage , 175 amp main fuse near battery connection .

Check for blown fusible link and possible bad relay. On relay, with everything off and hot battery hook u battery and give it ten minuets or so, then feel the top of eac relay. if you find a warm or hot one Bingo!

Did you have the charging system diagnosed or did you just guess at it being the alternator . The charging system is computer controlled . The starter isn't working because low power , battery dead . Is there B+ voltage at the wire on the back of the alternator .B+ voltage at pin 3 at the connector pluged into the alternator .
Charge the battery use a volt meter an test for B+ voltage at the places i mention . No check engine light ? DTC'S - diagnostic trouble codes stored .
Ford Smart Charge System Alternator Not Charging
Ford PCM controlled alternator testing

was the alternator bench tested? or tested on the car? if the alternator tests good off the car and the wiring has been tested, the ground may be loose or disconnected.

check whether is there any charging relay in the fuse box.

There are a few things you can check. There should be a large fuse in the fuse box in the engine compartment. I believe it is a 100amp fuse. If you connect the jumper cables backwards or even touch the wrong post for a split second it can cause that fuse to blow. Also check the connector on the back of the alternator they sometimes are dirty or have a bad connection in the plug also check to make sure the connectors are not open and are making good contact. Do yourself a favor and check all the fuses inside the cab and in the engine compartment. Good luck and let me know if this fixes it, if not I will research it. I will look for your reply over the next few days

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was the voltage regulator checked

There is a 1 amp fuse in the under hood fuse box for the alternator charging signal. Also, there is a 175 amp fusible link for the alternator, which is located under a plastic cover, next to the top of the timing belt cover.