Gilly,
We did have the alternator and battery checked and told that they were okay. However, we intend to purchase a new battery anyway. We do not intent to have the radio reset until we are sure that the electrical system is operating perfectly. We are very glad to find out that the issue with the radio is 'security mode'.....Thank you so much for all of your help. We are new owners of the 190...actually we bought two! So you will probably be hearing from us a lot to access your expertise. We are going on vacation in two days and then we will be back at the cars again! Again, we appreciate your input.
Elleigh