2003 4.3 MPI mercruiserTach issue Alpha 1

hellion68

Cadet
Joined
Jun 2, 2011
Messages
14
Have had a problem with the tach since we purchased the boat. It would cut in and out and the light would flash at night. Found a ground terminal loose at the back of the tach, and it had to be removed to tighten the ground terminal down. The signal does not appear to work now, not that I checked it before but(gray wire looking for a flashing test light). I also have a tach signal pigtail at the engine, also gray in color that shows no test light flashing. is there some other test I can perform to check the signal output without a different tach to hook up? It may just be a bad meter but I want to make sure tach signal is there first?
 
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