Join Date: Dec 2002
Location: Saint Louis, Missouri
Even though something is new it still may not be right. I have installed car audio and other electronics for 20+ years and while rare when dealing with major manufacturers there is still a low percentage of out of the box defectives.
Ok. Lets say the tach is fine and the HEI is fine when the tach wire is not plugged into it. To see if the wire from the HEI to the tach is either in the wrong slot on the bulkhead connector or is possibly shorted somewhere, unplug the tach input signal at the back of the tach itself (the wire that goes up to the HEI). Now if the tach wire is plugged into the HEI and the car runs then it is either something in the tach or the wiring after the point where it is disconnected by the tach. If the engine does not run with the wire unplugged at the back of the tach and plugged into the HEI then there is a problem between the disconnected wire at the back of the tach and the plug on the HEI.
1974 Spirit Of America Nova (being restored), 1973 Nova Custom, 1968 Chevy II (Garage Find 2012)
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