Alternator charging problem?

OK this has been one crazy ride. I figured the problem out and even the ford tec at the plant could not understand what would cause the problem. If you look at the diagram you will see dash indicator light look real close and you will see it is fussed if this fuss blows it cuts out the charging system all together. I understand that most new cars our running this same system, if you have a dash light indicator and it goes out it will not send the signal to the alternator to charge and the simple way to check it is turn on your ignition switch and if the light does not come on and the alternator does not want to charge check it it could the problem. I remember working on a Mercedes Benz truck with the same problem and the repair manuals do not say a word about it after 2 alternators and hours of hair pulling we found the problem the light in the dash indicate r was out. So remember that a lot of new cars our coming out with this set up. Thanks for your help.