edward t--I have to say one thing, the worst chase my tail troubleshoots I have every dealt with were failed on install electrical items. Granted it sounds basic, but it's true. Hats off to you stupidattimes, your user name has been used by all of us at some point in time or another. I'll give you a good one. I had a 5 series 4Y truck that would run hot and at times overheat. No leaks other than the overflow, pump bearing and seal good, fan turned in the right direction and facing the right way, rodded out the radiator, R+R stat, blew-out reg coolant lines and block ports, shroud tight and in place, timing correct, tune up kit good. This unit was at a grout manufacturing company, burp plug would spit as it should. No luck. The only thing left was the water pump. Finally and lastly out of sheer frustration I pulled the water pump, which had a good bearing and the front seal was nice and tight. I found the impeller on the pump,(which was steel, not cast iron) had been worn and it resembeled a 5 inch circular razor blade!!! We all fall short, and I realized then I could'nt fix the crack of dawn!!!!! later bro