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brake light on dash blinking
your park brakes are on
if there is a little round red light blinking on dash right side it is your key
Possibly a security system activation light.
That light indicates the security system is working properly.
Could be alarm...
Worn brake pads can cause the brake light to blink on the dash in a 1993 GMC Sierra 1500. This can also be caused by a faulty light.
That's the warning light for your burglar alarm. Locking the car turns it on.
The alarm
It sounds like an anti-theft indicator light. The blinking light means that the security system is active and is functioning properly.
That is perfectly normal. It keeps theives away and is a security light.
There may be a grounding problem in the dash light assembly, or the shield that contains the light may be damaged.