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Which spade on the ign. coil is for the tach?? 200 1978

posted by  Carlos the Jacker on  Sat Mar 16 05:29 CST 2002
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Every tach I've dealt with (not that many) has worked from the negative terminal.

Another thing you might want to check into is whether the coil on your 78 is "leaky". I had an old coil kill a nice new Sun tach once, and it turned out to be leakage, which gets worse as they get older. It didn't happen immediately, took a few weeks IIRC. And no, I can't remember anymore how I tested the coil. Looking at it in the dark with the engine running might do it.






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