I replaced my alternator, now my radio doesn't work 2006 Ford focus.

Due to the complexity's of today's vehicles the majority of owners or DIYer's do not possess the proper diagnostic equipment nor the knowledge and training that's required to effectively and successfully perform their own automobile troubleshooting / repair. Therefore it is highly recommended to seek professional *hands-on* assistance with this issue as that tends to be the most cost effective solution.. We could post a 'list' of the possibilities - however that isn't going to help due to the fact the same diagnostic equipment and troubleshooting knowledge is still going to be required. Good luck! ▪️ https://repairpal.com/repair-shops ▪️