help !!! ford focus 1.8 tdci problems

[steevio]

hi was coming home from work on Friday when the temp gauge shot up and showed high engine temp on dash. then my wipers slowed to a crawl then I lost power steering and abs and airbag light came on have hooked up to obd2 and the fault codes that it showed are b1318 - body / po622 powertrain - generator field "f" terminal control circuit / p1632  powertrain - theft deterrent- fuel disabled. I have changed the battery and checked for corrosion but all seems ok. has anyone got any ideas on what the problem could be or any advice on how to diagnose the problem.

                                                                                                       thanks steve

[iantt]

have you checked the wiring at the alternator?

[iantt]

and i would post this up in focus section and not fiesta.