Honeywell siren won't go off, just chirps once.

I have a Honeywell 20P that I installed and programed myself.  It has 2 expander boards.  It has been working flawlessly for at least a year.  Suddenly the siren will not go off when the alarm is triggered, it just beeps once.  Because of this, the Wireless GSM sender does not send a signal to the monitoring service.
 
Any Ideas?
 
Thanks
 
John
 
 

Probably exceeding the panel's aux power output or bad battery.
 
Disconnect everything connected to term 3 and set off the system, measure the voltage.

I discovered that I did not have a good connection to the battery.  It was also causing the system to be a little sluggish, or at least looked slow at the keypad display.
 
Thanks
 
John

Should have no effect on the panel's speed or response. Would affect the siren (extra current drawn off battery).