OK

Any other dash lights come on?
Put the heater on defrost and turn key to on ..what happens to blower

The reason I had u try headlights is cuz if one has a bad connection at bat terminal, that would explain it, but if lights stayed on, that can be dismissed .
try blower

I suspect ign sw .. but report back on these 2 test first.

The NSS would be suspect for no crank if it were not for the dash lights...
that indicates there is no power before NSS at the moment [NSS is between ign sw and starter, nothing to do with bat indicator lamp