Alternator / Computer, or am I being scammed?

It's difficult to provide a definitive answer without more information about the specific situation. Here are some potential explanations:

1. Genuine Issue: Sometimes, a car might genuinely have both an alternator problem and a computer problem that require attention. While it may seem unexpected, it's not necessarily unusual.

2. Misdiagnosis: There is a possibility that the mechanic may have misdiagnosed the issue. It's always a good idea to seek a second opinion or consult another trusted mechanic to verify the diagnosis.

3. Upselling: Certain repair shops might engage in upselling tactics, recommending unnecessary repairs to increase the cost of the services.

4. Lack of Expertise: Some mechanics may not have sufficient expertise or knowledge to accurately diagnose the real problem, recommending irrelevant or excessive repairs.

5. Genuine Mistake: There's also a chance that it was a genuine mistake due to confusion or misunderstanding, which could be resolved through clear communication.

To ascertain the authenticity of the situation, it's crucial to get clear explanations from the mechanic about the diagnosis, the symptoms observed, and why those specific parts need replacement. If you have doubts or feel something isn't right, don't hesitate to seek a second opinion or consider talking to someone else knowledgeable in automotive repairs.