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[freebeard]

Polarity should be a matter of swapping the two lead wires. If anything it's probably some gotcha like cooling air or one-way bearings.

[Piotrsko]

Originally Posted by freebeard

Polarity should be a matter of swapping the two lead wires. If anything it's probably some gotcha like cooling air or one-way bearings.

Alternators are generally case grounded for one leg. I accept cooling air issues but that shouldn't be a problem since most airpowered things turn only one way

[freebeard]

All that being the case, here's the thinking behind ganging or coupling two together:

www.autospeed.com/: Designing and building Tuned Mass Dampers to reduce driving light vibration

A dumbbell grasped in the middle has a high polar moment.