How can I test and find the polarity of an ignition coil (**that's not connected to a car**) using a multi-meter. 

[![img1][1]][1]

**I have different high voltage coils I need to test for polarity not only an ignition coil**.  But I think I can use the same test to find the polarity of the ignition coil to check the polarity of the other coils.

Example of another coil I need to test for polarity.  Boost Step Up Power Module High Voltage Generator Converter
(**I do know the polarity of the red and green input wires, it's the two red output wires I'm trying to find / test the polarities of.**)

[![img2][2]][2]


  [1]: https://i.sstatic.net/GcxUs.png
  [2]: https://i.sstatic.net/i2ke8.png