The charger is bad, or it's "output protection" has determined that 14V is somehow too high and is inhibiting the output charge voltage. Funny thing about chargers...some are "intelligent" and won't turn on unless they detect the current draw or voltage is at or less than 13V. Not familiar with the "Global" charger, but it may be one of the Harbor Freight or "inexpensive" one from discount parts stores like Philmore...
If a trickle charger like a battery tender, you would still have the open circuit voltage of around 14V so you would actually be able to determine if it is good...once connected to the battery, it would probably match the battery, or let the battery settle for an hour and once it is at 13V, it would rise very close to the open circuit battery voltage of the battery tender and indicate yellow showing it is accepting a charge.