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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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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