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Topic
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Can a coil be bad even if it’s showing 12 volts at pos. and neg. post . I ask because I am not getting any ohm reading on the two post at any ohm setting just zero. When I check the high voltage tower I get 8,000 ohms and 2 different sources have two different perimeters for the readings ,but according to the two 8,000 is still low . So I’m wondering if my coil is bad. My points are open and closing, cap and rotor and points are new .Points are set at .016 . When I crank the engine (KEY ON) 12 volts going to coil , no spark at the plugs . The point plate in the distributor is internally grounded . 12 volts going from ignition switch to one side of ballast resistor. Driving me nuts to say the least .. Trying to find an auto store to check my coil with a machine is non-exsistant . I appreciate any and all help and Thank’s in advance.
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Pull the high tension wire (spark plug wire between coil and distributor) from the distributor and either arrange it close to a ground, or attach it to a spark tester. Disconnect points (trigger) wire from negative side of coil, turn on key, and use a jumper to momentarily connect the negative side of the coil to ground, then disconnect it. If you get spark, coil is good, if you don’t get spark coil isn’t working.
If the coil is good, then I would look carefully at the trigger wire between the coil and the distributor to see if it is shorted somewhere, keeping the coil constantly grounded instead of pulsing it when the points open and close.
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