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Have you checked the voltage while this problem is occuring? It does sound like to me the system voltage at the time of this problem is low and getting lower as you drive, All of your systems point to this, as when you load the electrical system more, things shut off. An alternator can sometimes intermittently charge, they can go in and out when the brushes get so worn they start to make occasional contact. Is this the original alternator? thanks.
Yes, I feel confident that a new alternator will repair your issue there. Being the alternator has never been replaced before, it would be consistent with age that it is likely your problem, It is what I would replace if it were my car. Let me know if you have any further questions. Thank you.
Hello, thought I would follow up with you. Did you get the alternator replaced? Is the vehicle running well now? thanks.