Posted by Steve@Advance on February 08, 2017 at 08:10:18 from (24.182.105.179):
In Reply to: Polarity, am I wrong. posted by David G on February 08, 2017 at 06:51:15:
I could be completely off track here, happened before...
But I'm thinking the difference is the composition of the contact material.
Seems I remember there is a difference in the metals used, something to do with the polarity and the nature of the arc transferring material from one contact to the other.
DC is very aggressive when it comes to arcing, and a regulator is basically arcing constantly to maintain the proper voltage. The result is a shortened life of the contacts if the regulator is labeled positive or negative ground and is reversed. Chances are the aftermarket ones don't have this feature, and don't care.
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