The Chiltons & Haynes manuals are useless and a big waste of money, they are both published by the same company and have the same pics & info. Very little info on the turbo cars and even then it only seems to cover the 1978 to 83 carb turbos. Waste of time and cash.
Factory TR Service Manual is the best option.
What excatly are you looking for in regards to the 1984-85 & 1986-87 wiring?
I have complete manuals for all years and could scan the info you need as long as it is not excessive.