fixed!
alternator charge output on load is slightly low, but il check it again tomorrow, but right now getting 14.2 volts with no electrics on, and 13.2 with electrics on.
the story:
suddenly stopped charging, i checked the wiring, all ok, so bought a second hand tested alternator, fitted it, still no charge, so went back to the wiring and re-checked, confirmed again all ok, hmmmmm so i decided to send both alternators away to be bench tested, both failed, no charge! so had the second hand unit repaired (looks like it got damaged in the post) so it was re- bench tested confirmed ok, re-fitted and still no charge! so re-checked the wiring again! this time the igntion live in the 3 pin plug wasnt working, i couldnt find a fuse anywhere for this, so i will have to get this sorted by someone who knows whats what, for now so i re-wired a new seperate fused ignition live in, and its now working perfect.