key turns on but wont crank on 1998 Infiniti I30

my battery was dead i jump started made it to work ,after work dead again put a new battery in worked fine for 5 days now key turns all ind. lights come on but car wont crank all lights head lights are brite .but it wont crank even with a jump start

by in Stanhope, NJ on August 23, 2012
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3 answers
ANSWER by , August 24, 2012
first make sure u have 12v on battery by itself , , then clean cables terminals very well ,, connect back and inspect alternator , it has to generate at least 14v ....
ANSWER by , August 23, 2012
Have starter checked
ANSWER by , August 24, 2012
have charging system ck and also ck starter