Alternator wiring

Well finally had some time to fire up the car and have a problem.
Car is over charging.Am get 15.2 at fast idle which isnt right.
Have removed regulator,cleaned all grounds,have taken bulkhead connectors apart and cleaned.
Have trunk mounted battery,would this effect charging output.
Have tested hot side of ignition system with muliti meter ,one on battery pos and over on ignition side of regulator.Getting 1.5 volts ,have i done this correct.
Starting to get a bit lost,would like to track this down with the help of you fine people.
Any ideas what to do next....Help