DOHCD15 Posted February 27, 2010 Share Posted February 27, 2010 i just installed an autometer tach in a 1971 240z, i am using the factory tach harness and i now use the green and white stripped wire as my tach signal. if i try to start the car with the green wire connected to the negative side of my coil my car cranks and cranks with no fire and the moment i remove it the car fires right up. i can then attach the green wire back to the negative side of the coil and the tach works just fine. why won't the tach allow me to start the car but runs just fine when attached to the coil after the vehicle is on. Quote Link to comment Share on other sites More sharing options...
Dtsnlvrs Posted February 27, 2010 Share Posted February 27, 2010 You really need to study the Factory Service Manual, or another good source for the wiring diagram before you continue any further....I do not know what you connected to what, but i do know that the factory tach was in inductive loop type, which supplied the hot to the positive side of the coil, instead of reading the neg side. Get a copy of the FSM search around here, I know it is linked somwhere. Quote Link to comment Share on other sites More sharing options...
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