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procedure TForm1.Button1Click(Sender: TObject);
begin
edit1.color:= clred;
timer1.Enabled:= true;
end;

procedure TForm1.Timer1Timer(Sender: TObject);
begin
if edit1.color = clred then
begin
edit2.color:= clyellow;
edit1.Color:= clwindow;
timer2.Enabled:= true;
timer1.enabled:= false;
end;
end;

procedure TForm1.Timer2Timer(Sender: TObject);
begin
if edit2.color = clyellow then
begin
edit3.color:= clgreen;
edit2.color:= clwindow;
timer3.Enabled:= true ;
timer2.enabled:= false;

end
end;


procedure TForm1.Timer3Timer(Sender: TObject);
begin
if edit3.color = clgreen then
begin
edit4.Color:= clyellow;
edit3.Color:= clwindow;
timer1.Enabled:= true ;
timer3.enabled:= false;

end
end;

procedure TForm1.Timer4Timer(Sender: TObject);
begin
if edit4.color = clgreen then
begin
edit4.color:= clwindow;
edit1.color:= clred;
timer1.Enabled:= true;
timer4.Enabled:= false;

end
end;					

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procedure TForm1.Timer3Timer(Sender: TObject);  
begin  
if edit3.color = clgreen then  
begin  
edit4.Color:= clyellow;  //Hier setzt du edit4 auf gelb...
edit3.Color:= clwindow;  
timer1.Enabled:= true ;  
timer3.enabled:= false;  

 
end  
end;  

 
procedure TForm1.Timer4Timer(Sender: TObject);  
begin  
if edit4.color = clgreen then  //... frägst hier aber auf grün ab. Was bedeutet, dass deine Bedingung nie wahr wird.
begin  
edit4.color:= clwindow;  
edit1.color:= clred;  
timer1.Enabled:= true;  
timer4.Enabled:= false;  

 
end  
end;