My 2nd DB queries are showing no results, why?

So I have a 2nd db and i’m trying to query from it but i’m getting no results or errors, why is this?

This is what I use to show results:

global $newdb;
$newdb = $newdb->get_results("SELECT * FROM test");

And this is my connection in functions.php:

add_action('init','my_new_db');
function my_new_db(){
global $newdb;
 $newdb = new wpdb('test', 'test', 'test', 'localhost');
 $newdb->show_errors();
}

I guess the fact that I get no errors means I have a connection?

Anyway please help!