T100 radio won't work after battery replaced

The stock radio in my 96 T100 won't work after the battery was replaced. It says SEC. The truck is automatic. Can anyone help?
Thanks
Danielle

Yer security feature has activated. You'll need to put in the security code to unlock it. This is to prevent someone from stealing yer stock radio. Go figure.

I take it that you bought the truck used? You should be able to have the dealership unlock it fer you... ;)

I have my stock radio I will send you if they want too much cash to unlock it fer you... :D Just pay fer shipping. ;)

Thanks- I actually bought it at an auction. I'll see if a dealer around here will do it.