I own a 1968 sedan deville. I have just rebuilt my front end. Ditched my ac, Put in a brand new radiator, water pump, and thermostat. Still having overheating problems! Gen light stays on. I read in another post that a guy reset his external regulator but mine was not tripped or whatever. I think honestly its a vacuum issue. Anyone have any insight on this? Replaced my temp and oil sending units even. I am new to being a mechanic but am a very apt and am a good problem solver but this is beyond me! Thank you in advance.