Just started reading How To Diagnose and Repair Automtive Electrical Systems by Tracy Martin, who say, "Poor electrical connections are the most common cause of many electrical problems. While this staement may seem obvious, in reality, few mechanics think to look first . . ."

Funny, just read that before lunch and was digesting it. Thinking that changing the part and giving it a solid connection probably fixed most of my problems. Years ago I'd change starter, alt, bat and cables all at the same time.