Pcm Re-Programing

[aandydelboy]

Hi there this is my first time on the forum, I bought a Chrysler 300c on a 10 plate three weeks ago, all went well until last week when the battery went flat overnight and charge light was on, I took it to my local garage, he diagnosed alternator fault, ordered and fitted new alternator, still not charging, and ingnition light on, its been sugested that the PCM board has become corrupted, I've got a second hand PCM from same age car, but it needs programing to my car, does any one know how you do this please, desperate, I have to take my daughter and family to the airport in 10 days, their going to Australia.