Is it a *new* Nissan alt, or is it an aftermarket rebuilt part? Most
people have had good experience with Nissan rebuilts and bad experience
with cheap (Autozone type) parts. They often fail shortly after
installation.

If you use Google Groups to search this group for "starter" or perhaps "start"
you'll find a lot of old discussions about the "quality?" of non Nissan
starters.

--
Address is NOT monitored due to SPAM volume from newsgroups.  DO NOT REPLY to
post directly.

The problem might not be the starter, especially if replaced twice.  My 95
sometimes fails to crank (repeatedly) when I turn the key.  It fires right
up when it does crank.  But I have not tracked whether it is a problem
with the ignition switch or a relay (others have posted about the same
problem).

When its starter was going bad some time ago, it had been cranking roughly
for quite some time.  I replaced it when it finally stopped on its dead
spot.

MOST definitely get a Nissan starter, this is a must for this part in
particular, yes they are expensive but aftermarket ones are a constant
problem. Sometimes you can use "Autozone" type parts but the alternator,
starter and a few others are not some of them.
About Lifetime replacements from car parts stores, I went through 4 count
'em 4 alternators for a 350 CHEVY engine before I found a good one from
Autozone......they can't even get a flippin GM part right, much less an
import!
Good Luck,
Bitsbucket