alternator issue?

carfreak

Registered
so here is the issue. when i try to start my 78 mark v it makes a clicking noise
lights and radio work, but the alt lite flashes. when i jump the battery the car starts right up. so is it the alternator? it seems odd because the alternator is new
(according to the guy who sold it) it looks new too. if so how much would a new alternator cost?
 
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