6V or 12V coil ?

Dave Z (OH)

New User
Looking into EI conversion for front mount 9N, and not sure what voltage coil I have. PO converted to 12V, and has the little white block
resistor in system (not sure it matters though, heard system will work it in line weither 6V or 12V coil). Coil looks not to be original but
not certain of that. Is there a way to check with multi-meter to determine voltage rating of coil? Thanks in advance for the help.
 
Square coil or round coil?

Round coil should be 3.25 ohms or more.

Square rarely exceeds 2.25, hence the need for the oem ballast resistor, not the white block resistor.
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