Just my 2 cents worth on the topic as in the past I have come across coils that were not marked for + and -
Old school way of checking polarity as I recall was to remove a plug wire and hold it a 1/4" from the block, run the engine and hold the pointed end of a pencil between the wire end and the engine.
You then can clearly see the direction the spark is jumping.
If it jumps from the pencil to the block all is well.
If it jumps from the block to the pencil then you are hooked up backwards.
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