Some good help and advice there for you Belgiantwin. As you have the same problem as before you replaced the 3 items that tells me your problem is not there. Regulator does sound possible. You need to check the components as described in the manual.
The first test to me is Voltage across battery without the engine running – It must be over 12v
Test the same with the engine running on tick over – the voltage reading should increase
Test the same with the engine running over 3000 revs – the reading should increase again to between 14v and 15v
The readings I have given are approximate but you should detect an increase in voltage at each of the 3 stages.
