engine will not start

Hi, I have a 1985 Trans am. This car was converted to right hand drive in
Australia, not a good job, all the electric behind the dash was horrible.
Many things I've fixed. Three weeks ago I started the engine and it fired up
first time. I then put all the covers on finished every thing. Now the car does
not start anymore. After an unsuccessful start attempt, I turned the key
back to off, then I could hear three  times beep-beep.   I checked the fuel
line and pump, both are ok. I assume this signal indicates a fault and would
like to know what it is.
The repair manual I bought from Haynes is not very clear on the electrical
side.