Thanks for all the help darkhorse737 I checked the fuses and they are definitely good. I have also installed a new battery.
I did some investigation into alternators and found out that they have rectifiers and regulators. I think some the diodes on the rectifier have been damaged by some grass and insects I have found in the airpipe that cools it.
About half of the rectifier was totally blocked by the debris, that might have caused some of the diodes to over heat or short out. I can see discoloration on them.
Not sure if this is the case but I have ordered a new one from the agents at R7425incl about $ 929.86 (rip off) that is not installed I have to install and I also have to give them the old unit
I also disconnected the power terminal while the car was running and it keeps running but does die when the volts go below 8v. Alternator seems to supply less and less power as it runs.
I am not sure how they tested it on the bench and found it running good as it definitely doesn't run good in the car.
