its not charging on 1999 Nissan Pathfinder

i was driving when my lights went dim and i had no guages, i replaced the batterie and put a new alternator on still had no guages worken and the new batterie died within 30 mins i looked at the fuses through the top glass of them they looked good also im missing the belt tension rod but tryed to tighten it the best i could does this have to be really tight in order for it to give me guages and charge up ?? tks kevin

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1 answer
If the serpentine belt isnt tight on the alternator pulley the alternator wont charge the battery, have a tech check the belt tensioner