Z intermittently completely dead -- electrical gremlins

Originally Posted by jchammond

I'd test battery & connections.
Put a volt meter on it & read surface charge; 12.60V is fully charged,
With meter connected-move it in a position where you can read it & turn on ignition.
In this warm of weather; battery voltage shouldn't drop below 10.00 volts while cranking.
But sounds like you have either a failed battery or corroded or loose connection.