Wont crank over on 2001 Infiniti I30

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removed starter, auto zone said it is good so put starter back in, cleaned cables worked for about 5 days now NO CRANK again. Replaced cable, clamps,Checked voltage on both sides of solinoid, good when in start position still NO CRANK. IS there a park switch/neutral start switch? Where is it located? or is the starter bad?
(1) Answer
Sure - there is a transmission range / mode switch.

You'll find the switch around the area of the linkage area on the side of the transmission.

I would lean towards some kind of electrical issue like this switch since you have already had the starter bench tested....although...I suppose a test like that is only as good as who does it.