Posted by John T on February 08, 2017 at 09:17:59 from (76.4.98.182):
In Reply to: Polarity, am I wrong. posted by David G on February 08, 2017 at 06:51:15:
David, when I was a used tractor dealer and farmer doing a lot of tractor electrical repair on circa 40's through 60's genny and VR equipped tractors, many of which were Delco systems, SOME VR'S WERE CLEARLY LABELED FOR POS GROUND WHILE OTHERS WERE CLEARLY LABELED FOR NEG GROUND AND I BET DELCO DESIGNED AND LABELED THEM AS SUCH FOR A SOUND ENGINEERING REASON. It was my understanding (no warranty) it had to do with the relay contacts and their particular coatings and which contacts used what coating. Also if solid state devices were utilized within (even though still primarily a mechanical VR), its obvious why they required a certain polarity. Then it seems later years I saw some VR's that were suitable for EITHER polarity.
Sooooooooo I may be wrong but its my engineers opinion THERE IS A DIFFERENCE in VR's for use with different polarity. That being said its my best engineering guess that if there's no solid state devices used (like blocking diodes) while a VR may still "work" and the incorrect polarity, it may well last LONGER if the correct polarity VR is used.
That's my story n Ima stickin to it lol BUT NO WARRANTY IT MAY BE WRONG AS RAIN
John T Retired Electrical Engineer NEVER a designer of VR's
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