Interesting, all I have to go on is the downloads I saved from my (now expired) Mitchell 87 shop manual subscription.

Somehow I missed downloading the wireing diagram page that shows the ECT wireing.

Here's a copy of the ect control unit location diagram that I have:

http://img222.imageshack.us/my.php?image=hoodtransclusternt4.gif

Sorry I don't have more info...
Dave