Q: 3 alternators replaced!

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My mechanic has no idea what's wrong. Went for a new alternator, it ran but won't charge battery. Then dash lights, running lights and brakes and do tag lights all went out. Replaced relay and alternator and again same issue. Battery won't charge ,alternators are going bad. Replaced again today to only have this happen again. Please please help me.

My car has 312000 miles.
My car has an automatic transmission.

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