The wire colors are difficult to determine---too deteriorated on the motor side--too dirty/discolored on the chassis side. I've been able to come up with wire diagrams for the non-turbo models (which don't show the junction block anyway) --but not for the Turbo. If I mess around with the junction much the insulation that's left will crumble altogether and is bound to cause shorts. If I can learn what the wires service I wouldn't be afraid to tear into the job. The wires at the top of the junction seem to follow the pattern of my 1980 245 -- the simple ones like coolant temp, starter, etc -- it's the ones lower in the junction that are most difficult to see/determine. -- Dave