I couldn't hear mine either although everybody else could. Hearing damage from Vietnam.
My fix was to install a bright red LED in the dash wired in series with the alarm buzzer.
Turn my key on it blinks once. If alarm goes off it comes on and stays on.
Edited by Muzzlebrake (09/16/17 08:10 AM)
From Genesis: "And God promised men that good and obedient wives would be found in all corners of the earth."
Then He made the earth round...and He laughed and laughed and laughed!