Ok. This may help you out Larry.Larry:
Is there an after-market shop manual that covers the GN? My Chilton's for '75-'87 Regal/Century doesn't seem to know that the GN exists.
It also doesn't seem to know anything about the Powermaster brake MC. I'll probably have to buy a FSM to get decent wiring diagrams that show the pin-out for the pressure switch and pump motor. Which year(s) of FSM would be best? I have found FSMs for '84, '86, and '87. The '87 is, I think, an adjunct to the full FSM, with GN-specific information, only.