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tach signal


optimaxtech

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Would anyone know? we have a 260 with an engine (L28) from a ZX, with carbed head installed. The distributor has electronic spark instead of points. Where should the tach signal come from? I believe currently it is still connected to the negative post on the coil, yet the tach does not function. I personally have not been to the car yet to assist my friend. Any help would be greatly appreciated

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I haven't looked into on the on the 260, but on my 73 240Z the tach signal used a current loop and two wires in the area of the coil go to the tach. One of the wires by the coil goes to the tach, one comes back from the tach and is hooked to the coil. This might help you to figure it out.

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I was thinking the ballast resistor too, but it might not be there anymore with an electronic ignition. When I went electronic, I left the ballast resistor there just for the junction for the two wires. the other end of the ballast resistor wasn't connected to anything.

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On mine, yes. Can guarantee this is what you have. I am thinking the ignition power wire went to a connector on the ballast resistor, one tach wire went to the same connector, the other tach wire went to the positive side of the coil. There was no connection to the other side of the ballast resistor.

So the coil power path looks like battery->ign switch->ballast resistor->tach->coil. Lots of stuff (too much stuff) between the battery and the coil.

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