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Tach only works on positive side of coil 82 22r

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Old May 25, 2011 | 08:53 PM
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From: granada hills ca
Tach only works on positive side of coil 82 22r

So as the title says.. i hooked up a tach a few weeks ago, and it only works on the positive side of the coil.. works great.. nothing heats up or etc.. just curious as to why this would be so/.. its a 82 2x4 22r 5 speed. all stock. havent messed with any of the wires, truck runs perfect (42 miles each way to work) and i get 28-32 mpg.... at 70-80 mph

any ideas?
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