thanks again, that tool is quite powerful and much of it is beyond my knowledge, so i may just wait until you have time to post some detail.

from my limited understanding, i am able to identify x1312 and x1313 on my harness as the blue and wine quadlocks
the black quadlock i have is not listed anywhere - i have found a 16 pin black connector but this is not one i have.

the link i gave earlier to retrofit harness was the best picture i could find online, the actual part i have is 61128384473 and was purchased on ebay.

however, looking at realoem this appears to be from 98 to 00 and maybe the one i need is 61126915132.

on further investigation, the black 12 pin connector seems to relate to the trimble module for the mk1/2 gps units.
if this is the case, can i just ignore this or would i need the updated harness?

appreciate any further thoughts.