Car does not start intermittently. Replaced battery, no change.

Thanks but that's the obvious answer. Not that easy as Xterras have two reported issues I got from another source: 1) Ignition Relay Switch; 2) Distributor bearing can lock up and not allow a start. The only Nissan mechanic in town is on vacation this whole week, so I will dig into it myself this weekend.

I AGREE 100% with you , but the reason I am suggesting the obvious again, is because last year one of our 'master techs' at the dealership I'm at , got fooled by 'hidden' corrosion' on the positive terminal.EXACT same symptoms, when it cranked it was great ......then ... BOOM , nothing, and if you checked (which I did-at first by wiggling), they were tight.After his third starter, I volunteered to check it out. Pulled the positive off completely and it was glazed with a nice shiny coating of corrosion. Chipped , scraped and sanded off til clean COPPER, put it back on --DONE! Would either of the things you mentioned , distributor bearing or relay , be affected by wiggling the battery cable? In ANY way? That is the info I see , and what I'm basing my call on.

Thanks. That sounds great. I'll look at it.