I been traveling n missed the VR discussion below but until Bob arrives I have some thoughts. I"ve come across what I believe were suppression diodes on some units which is one of the reasons they would be polarity senstive.... One thing to consider when trying to dampen and supress arcing across VR relay contacts is that its not quite as simple as that relay just opens n closes similar to the old manual Low High charge light switches, they can "chatter" which acts to me like pulse width modualtion for more precise regulation and that amounts to changing the frequency (duty cycle) so Im not quite sure selecting the capacitance n resistance values will be as easy as if it were straight DC On and Off switching. Of course, each is still a single discrete DC switching occurence so maybe it IS EASY AFTER ALL????
The coatings on those relay contacts is expensive and Id tend to contribute that fact to why they may be scripming to save a few bucks and why the new ones fail so soon?????
Any agreement or disagreement or thoughts ?? NO WARRANTY ON THIS LOL just brainstorming here
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