Ok electrical experts, here are some more altenator measurements, idle 13.4 at revs steady 2mins @3000rpm will get up to 14v

At idle blower on full, high beam on, panic lights on, windscreen wiper on, 12v.
At 3000rpm 2mins just gets to 13v.
took out the brush reg assembly bushes look ok, long enough slip rings look ok.

how do i test the reg itself is it possible with a dig multimeter, probally have to remove the 68ohm across (if it were a trasistor) base and emiter. Is it possible to check, as the assembly is hard to get and expensive here in Australia.